JavaScript栈
<p><span style="font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; font-size: 14px; background-color: rgb(255, 255, 255);">本篇文章给大家带来了关于</span><a href="https://www.php.cn/course/list/17.html" target="_blank" textvalue="javascript视频教程" style="margin: 0px; padding: 0px; color: rgb(61, 167, 13); font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; font-size: 14px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-line: none !important;">javascript</a><span style="font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; font-size: 14px; background-color: rgb(255, 255, 255);">的相关知识，主要介绍了一文让你快速了解JavaScript栈，栈全称为堆栈，是一种先进后出的的数据结构，栈中只有两种基本操作，也就是插入和删除，也就是入栈和出栈操作，栈只有一端可以进行入栈和出栈操作，希望对大家有帮助。</span></p><p style="margin-top: 15px; margin-bottom: 15px; padding: 0px 0px 0px 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(61, 70, 77); box-sizing: border-box; border-radius: 8px; font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><br/></p><p style="margin-top: 15px; margin-bottom: 15px; padding: 0px 0px 0px 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(61, 70, 77); box-sizing: border-box; border-radius: 8px; font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"></p><p style="margin-top: 15px; margin-bottom: 15px; padding: 0px 0px 0px 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(61, 70, 77); box-sizing: border-box; border-radius: 8px; font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">【相关推荐：<a href="https://www.php.cn/course/list/17.html" target="_blank" textvalue="javascript视频教程" style="margin: 0px; padding: 0px; color: rgb(61, 167, 13); text-decoration-line: none !important;">javascript视频教程</a>、<a href="https://www.php.cn/course/list/1.html" target="_blank" style="margin: 0px; padding: 0px; color: rgb(61, 167, 13); text-decoration-line: none !important;">web前端</a>】</p><h2 style="margin: 0px; padding: 0px 0px 0px 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">什么是栈？</h2><p style="margin-top: 15px; margin-bottom: 15px; padding: 0px 0px 0px 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(61, 70, 77); box-sizing: border-box; border-radius: 8px; font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">栈全称为堆栈，是一种<strong style="margin: 0px; padding: 0px;">先进后出</strong>的的数据结构，栈中只有两种基本操作，也就是<strong style="margin: 0px; padding: 0px;">插入</strong>和<strong style="margin: 0px; padding: 0px;">删除</strong>，也就是<strong style="margin: 0px; padding: 0px;">入栈和出栈操作</strong>，<strong style="margin: 0px; padding: 0px;">栈只有一端可以进行入栈和出栈操作</strong>，我们将其称为<strong style="margin: 0px; padding: 0px;">栈顶</strong>，另一端称其为<strong style="margin: 0px; padding: 0px;">栈底</strong>；如下图展示了栈这个数据结构：</p><p style="margin-top: 15px; margin-bottom: 15px; padding: 0px 0px 0px 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(61, 70, 77); box-sizing: border-box; border-radius: 8px; font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255); text-align: center;"></p><h3 style="margin: 0px; padding: 0px; font-weight: 400; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">JavaScript中的栈</h3><p style="margin-top: 15px; margin-bottom: 15px; padding: 0px 0px 0px 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(61, 70, 77); box-sizing: border-box; border-radius: 8px; font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">JavaScript并没有栈这个数据类型，但是可以通过数组进行模拟，而且数组中提供的<code style="margin: 0px; padding: 2px 4px; font-size: 14.4px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px;">push()</code>和<code style="margin: 0px; padding: 2px 4px; font-size: 14.4px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px;">pop()</code>选项，正好实现先入后出的的操作，</p><p style="margin-top: 15px; margin-bottom: 15px; padding: 0px 0px 0px 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(61, 70, 77); box-sizing: border-box; border-radius: 8px; font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><strong style="margin: 0px; padding: 0px;">示例代码如下：</strong></p><table class="wcn_c_table" cellpadding="0" cellspacing="0" width="760"><tbody style="margin: 0px !important; padding: 0px !important; border-radius: 0px !important; background: none !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.1em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"><tr style="margin: 0px !important; padding: 0px !important; border-radius: 0px !important; background: none !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.1em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;" class="firstRow"><td class="gutter" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); margin: 0px !important; border-radius: 4px 0px 0px 4px !important; background: none !important; inset: auto !important; float: none !important; line-height: 1.1em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; box-sizing: content-box !important; min-height: auto !important; color: rgb(175, 175, 175) !important; user-select: none !important;" width="NaN"><p class="line number1 index0 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">1</p><p class="line number2 index1 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">2</p><p class="line number3 index2 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">3</p><p class="line number4 index3 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">4</p><p class="line number5 index4 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">5</p><p class="line number6 index5 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">6</p><p class="line number7 index6 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">7</p><p class="line number8 index7 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">8</p></td><td class="code" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); word-break: break-all; margin: 0px !important; border-radius: 0px !important; background: none !important; inset: auto !important; float: none !important; line-height: 1.1em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; box-sizing: content-box !important; min-height: auto !important;" width="719"><p class="line number1 index0 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">const stack = []</code></p><p class="line number2 index1 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"> </p><p class="line number3 index2 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js comments" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">// 入栈</code></p><p class="line number4 index3 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">stack.push(1)</code></p><p class="line number5 index4 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">stack.push(2)</code></p><p class="line number6 index5 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js comments" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">// 出栈</code></p><p class="line number7 index6 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">const v1 = stack.pop() </code><code class="js comments" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">// 2</code></p><p class="line number8 index7 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">const v2 = stack.pop() </code><code class="js comments" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">// 1</code></p></td></tr></tbody></table><h2 style="margin: 0px; padding: 0px 0px 0px 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">栈的应用场景</h2><p style="margin-top: 15px; margin-bottom: 15px; padding: 0px 0px 0px 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(61, 70, 77); box-sizing: border-box; border-radius: 8px; font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">栈是算法和程序中最常用的辅助结构，其的应用十分广泛，凡是需要先进后出场景都有栈的身影，比如：</p><ul style="padding: 0px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; font-size: 14px; white-space: normal; background-color: rgb(255, 255, 255);" class=" list-paddingleft-2"><li><p>函数调用堆栈</p></li><li><p>判断字符串括号是否有效</p></li></ul><p style="margin-top: 15px; margin-bottom: 15px; padding: 0px 0px 0px 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(61, 70, 77); box-sizing: border-box; border-radius: 8px; font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><strong style="margin: 0px; padding: 0px;">接下来我们依次来看：</strong></p><h3 style="margin: 0px; padding: 0px; font-weight: 400; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">函数调用堆栈</h3><p style="margin-top: 15px; margin-bottom: 15px; padding: 0px 0px 0px 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(61, 70, 77); box-sizing: border-box; border-radius: 8px; font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><strong style="margin: 0px; padding: 0px;">JavaScript中的函数调用堆栈就是一个应用栈的一个典型例子，比如下面这段代码：</strong></p><table class="wcn_c_table" cellpadding="0" cellspacing="0" width="760"><tbody style="margin: 0px !important; padding: 0px !important; border-radius: 0px !important; background: none !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.1em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"><tr style="margin: 0px !important; padding: 0px !important; border-radius: 0px !important; background: none !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.1em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;" class="firstRow"><td class="gutter" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); margin: 0px !important; border-radius: 4px 0px 0px 4px !important; background: none !important; inset: auto !important; float: none !important; line-height: 1.1em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; box-sizing: content-box !important; min-height: auto !important; color: rgb(175, 175, 175) !important; user-select: none !important;" width="NaN"><p class="line number1 index0 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">1</p><p class="line number2 index1 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">2</p><p class="line number3 index2 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">3</p><p class="line number4 index3 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">4</p><p class="line number5 index4 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">5</p><p class="line number6 index5 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">6</p><p class="line number7 index6 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">7</p><p class="line number8 index7 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">8</p></td><td class="code" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); word-break: break-all; margin: 0px !important; border-radius: 0px !important; background: none !important; inset: auto !important; float: none !important; line-height: 1.1em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; box-sizing: content-box !important; min-height: auto !important;" width="719"><p class="line number1 index0 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js keyword" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-weight: bold !important; min-height: auto !important;">function</code> <code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">f1() {}</code></p><p class="line number2 index1 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js keyword" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-weight: bold !important; min-height: auto !important;">function</code> <code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">f2() {</code></p><p class="line number3 index2 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">f1()</code></p><p class="line number4 index3 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">}</code></p><p class="line number5 index4 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js keyword" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-weight: bold !important; min-height: auto !important;">function</code> <code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">f3() {</code></p><p class="line number6 index5 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">f2()</code></p><p class="line number7 index6 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">}</code></p><p class="line number8 index7 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">f3()</code></p></td></tr></tbody></table><p style="margin-top: 15px; margin-bottom: 15px; padding: 0px 0px 0px 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(61, 70, 77); box-sizing: border-box; border-radius: 8px; font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><strong style="margin: 0px; padding: 0px;">如下图：</strong></p><p style="margin-top: 15px; margin-bottom: 15px; padding: 0px 0px 0px 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(61, 70, 77); box-sizing: border-box; border-radius: 8px; font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255); text-align: center;"></p><p style="margin-top: 15px; margin-bottom: 15px; padding: 0px 0px 0px 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(61, 70, 77); box-sizing: border-box; border-radius: 8px; font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><strong style="margin: 0px; padding: 0px;">执行过程如下：</strong></p><ul style="padding: 0px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; font-size: 14px; white-space: normal; background-color: rgb(255, 255, 255);" class=" list-paddingleft-2"><li><p>调用函数<code style="margin: 0px; padding: 2px 4px; font-size: 14.4px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px;">f3()</code>，将<code style="margin: 0px; padding: 2px 4px; font-size: 14.4px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px;">f3</code>压入堆栈；</p></li><li><p>在<code style="margin: 0px; padding: 2px 4px; font-size: 14.4px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px;">f3()</code>中调用了<code style="margin: 0px; padding: 2px 4px; font-size: 14.4px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px;">f2()</code>，将<code style="margin: 0px; padding: 2px 4px; font-size: 14.4px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px;">f2</code>压入堆栈；</p></li><li><p>在<code style="margin: 0px; padding: 2px 4px; font-size: 14.4px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px;">f2()</code>中又调用了<code style="margin: 0px; padding: 2px 4px; font-size: 14.4px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px;">f1()</code>，将<code style="margin: 0px; padding: 2px 4px; font-size: 14.4px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px;">f1</code>压入堆栈；</p></li><li><p>只有<code style="margin: 0px; padding: 2px 4px; font-size: 14.4px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px;">f1()</code>运行完成才能继续往下执行，所以<code style="margin: 0px; padding: 2px 4px; font-size: 14.4px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px;">f1()</code>先出栈，以此类推。</p></li></ul><h3 style="margin: 0px; padding: 0px; font-weight: 400; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">有效的括号</h3><p style="margin-top: 15px; margin-bottom: 15px; padding: 0px 0px 0px 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(61, 70, 77); box-sizing: border-box; border-radius: 8px; font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">有效的括号是力扣中的一个关于栈的算法题目，题目大意就是判断给定字符串中的括号是否匹配，匹配返回<code style="margin: 0px; padding: 2px 4px; font-size: 14.4px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px;">true</code>，否则返回<code style="margin: 0px; padding: 2px 4px; font-size: 14.4px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px;">false</code>。</p><p style="margin-top: 15px; margin-bottom: 15px; padding: 0px 0px 0px 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(61, 70, 77); box-sizing: border-box; border-radius: 8px; font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><strong style="margin: 0px; padding: 0px;">解题思路如下：</strong></p><ul style="padding: 0px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; font-size: 14px; white-space: normal; background-color: rgb(255, 255, 255);" class=" list-paddingleft-2"><li><p>判断字符串的长度是否为偶数，不为偶数直接返回<code style="margin: 0px; padding: 2px 4px; font-size: 14.4px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px;">false</code>，因为括号都是成对出现的；</p></li><li><p>新建一个栈；</p></li><li><p>遍历字符串，遍历到每一项时如果时左括号，将其压入栈；如果是右括号，与栈顶对比，如果相匹配则出栈，不匹配则返回<code style="margin: 0px; padding: 2px 4px; font-size: 14.4px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px;">false</code>。</p></li></ul><p style="margin-top: 15px; margin-bottom: 15px; padding: 0px 0px 0px 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(61, 70, 77); box-sizing: border-box; border-radius: 8px; font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><strong style="margin: 0px; padding: 0px;">实现代码如下：</strong></p><table class="wcn_c_table" cellpadding="0" cellspacing="0" width="760"><tbody style="margin: 0px !important; padding: 0px !important; border-radius: 0px !important; background: none !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.1em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"><tr style="margin: 0px !important; padding: 0px !important; border-radius: 0px !important; background: none !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.1em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;" class="firstRow"><td class="gutter" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); margin: 0px !important; border-radius: 4px 0px 0px 4px !important; background: none !important; inset: auto !important; float: none !important; line-height: 1.1em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; box-sizing: content-box !important; min-height: auto !important; color: rgb(175, 175, 175) !important; user-select: none !important;" width="NaN"><p class="line number1 index0 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">1</p><p class="line number2 index1 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">2</p><p class="line number3 index2 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">3</p><p class="line number4 index3 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">4</p><p class="line number5 index4 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">5</p><p class="line number6 index5 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">6</p><p class="line number7 index6 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">7</p><p class="line number8 index7 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">8</p><p class="line number9 index8 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">9</p><p class="line number10 index9 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">10</p><p class="line number11 index10 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">11</p><p class="line number12 index11 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">12</p><p class="line number13 index12 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">13</p><p class="line number14 index13 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">14</p><p class="line number15 index14 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">15</p><p class="line number16 index15 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">16</p><p class="line number17 index16 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">17</p><p class="line number18 index17 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">18</p><p class="line number19 index18 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">19</p><p class="line number20 index19 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">20</p><p class="line number21 index20 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">21</p><p class="line number22 index21 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">22</p><p class="line number23 index22 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">23</p><p class="line number24 index23 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">24</p><p class="line number25 index24 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">25</p><p class="line number26 index25 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">26</p><p class="line number27 index26 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 0.5em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important; text-align: right !important;">27</p></td><td class="code" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); word-break: break-all; margin: 0px !important; border-radius: 0px !important; background: none !important; inset: auto !important; float: none !important; line-height: 1.1em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; box-sizing: content-box !important; min-height: auto !important;" width="712"><p class="line number1 index0 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js comments" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">/**</code></p><p class="line number2 index1 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js comments" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">* @param {string} s</code></p><p class="line number3 index2 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js comments" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">* @return {boolean}</code></p><p class="line number4 index3 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js comments" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">*/</code></p><p class="line number5 index4 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js keyword" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-weight: bold !important; min-height: auto !important;">var</code> <code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">isValid = </code><code class="js keyword" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-weight: bold !important; min-height: auto !important;">function</code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">(s) {</code></p><p class="line number6 index5 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js keyword" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-weight: bold !important; min-height: auto !important;">if</code> <code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">(s.length % 2 !== 0) </code><code class="js keyword" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-weight: bold !important; min-height: auto !important;">return</code> <code class="js keyword" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-weight: bold !important; min-height: auto !important;">false</code></p><p class="line number7 index6 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">const stack = []</code></p><p class="line number8 index7 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js keyword" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-weight: bold !important; min-height: auto !important;">for</code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">(let i = 0; i<s.length; i++) {</code></p><p class="line number9 index8 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">const c = s </code><code class="js comments" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">// 记录当前项</code></p><p class="line number10 index9 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js keyword" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-weight: bold !important; min-height: auto !important;">if</code> <code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">(c === </code><code class="js string" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">(</code> <code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">|| c === </code><code class="js string" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">[</code> <code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">|| c===</code><code class="js string" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">{</code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">) {</code></p><p class="line number11 index10 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">stack.push(c)</code></p><p class="line number12 index11 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">} </code><code class="js keyword" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-weight: bold !important; min-height: auto !important;">else</code> <code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">{</code></p><p class="line number13 index12 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">const t = stack </code><code class="js comments" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">// 获取栈顶元素</code></p><p class="line number14 index13 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js keyword" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-weight: bold !important; min-height: auto !important;">if</code> <code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">(</code></p><p class="line number15 index14 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">(t === </code><code class="js string" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">(</code> <code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">&& c === </code><code class="js string" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">)</code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">) ||</code></p><p class="line number16 index15 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">(t === </code><code class="js string" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">[</code> <code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">&& c === </code><code class="js string" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">]</code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">) ||</code></p><p class="line number17 index16 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">(t === </code><code class="js string" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">{</code> <code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">&& c === </code><code class="js string" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">}</code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">)</code></p><p class="line number18 index17 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">) {</code></p><p class="line number19 index18 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">stack.pop()</code></p><p class="line number20 index19 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">} </code><code class="js keyword" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-weight: bold !important; min-height: auto !important;">else</code> <code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">{</code></p><p class="line number21 index20 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js keyword" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-weight: bold !important; min-height: auto !important;">return</code> <code class="js keyword" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-weight: bold !important; min-height: auto !important;">false</code></p><p class="line number22 index21 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">}</code></p><p class="line number23 index22 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">}</code></p><p class="line number24 index23 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">}</code></p><p class="line number25 index24 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js comments" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">// 如果为0表示全部匹配，有剩余则表示不匹配</code></p><p class="line number26 index25 alt1" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js spaces" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;"> </code><code class="js keyword" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-weight: bold !important; min-height: auto !important;">return</code> <code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">stack.length === 0</code></p><p class="line number27 index26 alt2" style="margin-top: 15px; margin-bottom: 15px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); line-height: 1.5em; border-radius: 8px; font-size: 16px; color: rgb(61, 70, 77); box-sizing: border-box; padding-right: 1em !important; padding-left: 1em !important; border-left: 3px solid rgb(67, 90, 95) !important; white-space: pre-wrap !important;"><code class="js plain" style="padding: 2px 4px; font-size: 13px; color: rgb(199, 37, 78); background-color: rgb(249, 242, 244); border-radius: 4px; font-family: Monaco, Menlo, Consolas, Courier New, monospace; margin: 0px !important; background-image: none !important; background-position: initial !important; background-size: initial !important; background-repeat: initial !important; background-attachment: initial !important; background-origin: initial !important; background-clip: initial !important; border: 0px !important; inset: auto !important; float: none !important; line-height: 1.5em !important; outline: 0px !important; overflow: visible !important; position: static !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important;">};</code></p></td></tr></tbody></table><blockquote style="margin: 0.8em 0px; padding: 10.5px 21px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); background-color: rgb(245, 245, 245); border-left: 4px solid rgb(204, 204, 204); color: rgb(85, 85, 85); font-size: 14px; font-family: Helvetica Neue, Helvetica, PingFang SC, 微软雅黑, Tahoma, Arial, sans-serif; white-space: normal;"><p style="margin-top: 15px; margin-bottom: 15px; padding: 0px 0px 0px 10px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(61, 70, 77); font-size: 16px; box-sizing: border-box; border-radius: 8px;">肯有还有更优的写法，这里直接使用的暴力解法。</p></blockquote><p><br/></p><link rel="stylesheet" href="//www.zhidianyun.cn/source/plugin/wcn_editor/public/wcn_editor_fit.css?v134_TZ8" id="wcn_editor_css"/>
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