使用 CSS 轻松实现一些高频出现的奇形怪状按钮
<p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">怎么样使用 CSS 实现一个内切角按钮呢、怎么样实现一个带箭头的按钮呢？</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">本文基于一些高频出现在设计稿中的，使用 CSS 实现稍微有点难度和技巧性的按钮，讲解使用 CSS 如何尽可能的实现它们。</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">先让我们来看看这些经常会出现的按钮形状：</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p><strong>矩形与圆角按钮</strong></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">正常而言，我们遇到的按钮就这两种 -- 矩形和圆角：</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">它们非常的简单，宽高和圆角和背景色。</span></span></span></p><blockquote><div class=btn rect>rect</div><br/> <div class=btn circle>circle</div></blockquote><blockquote>.btn {<br/> margin: 8px auto;<br/> flex-shrink: 0;<br/> width: 160px;<br/> height: 64px;<br/>}<br/>.rect {<br/> background: #f6ed8d;<br/>}<br/><br/>.circle {<br/> border-radius: 64px;<br/> background: #7de3c8;<br/>}</blockquote><p><strong>梯形与平行四边形</strong></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">接下来，基于矩形的变形，经常会出现梯形与平行四边形的按钮。</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">实现它们主要使用 transform 即可，但是要注意一点，使用了 transform 之后，标签内的文字也会同样的变形，所以，我们通常使用元素的伪元素去实现造型，这样可以做到不影响按钮内的文字。</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">平行四边形</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">使用 transform: skewX() 即可，注意上述说的，利用元素的伪元素实现平行四边形，做到不影响内部的文字。</span></span></span></p><blockquote><div class=btn parallelogram>Parallelogram</div></blockquote><blockquote>.parallelogram {<br/> position: relative;<br/> width: 160px;<br/> height: 64px;<br/><br/> &::before {<br/> content: ;<br/> position: absolute;<br/> top: 0;<br/> left: 0;<br/> bottom: 0;<br/> right: 0;<br/> background: #03f463;<br/> transform: skewX(15deg);<br/> }<br/>}</blockquote><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">如果不想使用伪元素，除了 transform: skewX()，平行四边形使用渐变也是可以实现的。</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">大概就是这样：</span></span></span></p><blockquote>{<br/> background: linear-gradient(45deg, transparent 22%, #04e6fb 22%, #9006fb 78%, transparent 0);<br/>}</blockquote><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">梯形</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">梯形比平行四边形稍微复杂一点，它多借助了 perspective，其实是利用了一定的 3D 变换。原理就是一个矩形，绕着 X 轴旋转，像是这样：</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">使用 perspective 和 transform: rotateX() 即可，当然，它们可以合在一起写：</span></span></span></p><blockquote><div class=btn trapezoid>Trapezoid</div></blockquote><blockquote>.parallelogram {<br/> position: relative;<br/> width: 160px;<br/> height: 64px;<br/><br/> &::after {<br/> content:;<br/> position: absolute;<br/> top: 0; right: 0; bottom: 0; left: 0;<br/> transform: perspective(40px) rotateX(10deg);<br/> transform-origin: bottom;<br/> background: #ff9800;<br/> }<br/>}</blockquote><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p><strong>切角 -- 纯色背景与渐变色背景</strong></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">接下来是切角图形，最常见的方法主要是借助渐变 linear-gradient 实现，来看这样一个图形</span></span></span></p><blockquote><div></div></blockquote><blockquote>.notching {<br/> background: linear-gradient(135deg, transparent 10px, #ff1493 0);<br/> background-repeat: no-repeat;<br/>}</blockquote><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">结果如下，</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">基于此，我们只需要利用多重渐变，实现 4 个这样的图形即可，并且，利用 background-position 定位到四个角：</span></span></span></p><blockquote><div class=notching>notching</div></blockquote><blockquote>.notching {<br/> background: <br/> linear-gradient(135deg, transparent 10px, #ff1493 0) top left,<br/> linear-gradient(-135deg, transparent 10px, #ff1493 0) top right,<br/> linear-gradient(-45deg, transparent 10px, #ff1493 0) bottom right,<br/> linear-gradient(45deg, transparent 10px, #ff1493 0) bottom left;<br/> background-size: 50% 50%;<br/> background-repeat: no-repeat;<br/>}</blockquote><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p><strong>利用 clip-path 实现渐变背景的切角图形</strong></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">当然，这个技巧有个问题，当要求底色是渐变色的时候，这个方法就比较笨拙了。</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">好在，我们还有另外一种方式，借助 clip-path 切出一个切角图形，这样，背景色可以是任意定制的颜色，无论是渐变还是纯色都不在话下：</span></span></span></p><blockquote><div class=clip-notching>notching</div></blockquote><blockquote>.clip-notching {<br/> background: linear-gradient(<br/> 45deg,<br/> #f9d9e7,<br/> #ff1493<br/> );<br/> clip-path: polygon(<br/> 15px 0,<br/> calc(100% - 15px) 0,<br/> 100% 15px,<br/> 100% calc(100% - 15px),<br/> calc(100% - 15px) 100%,<br/> 15px 100%,<br/> 0 calc(100% - 15px),<br/> 0 15px<br/> );<br/>}</blockquote><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">简单的实现一个渐变背景，接着核心就是，在渐变矩形图形的基础上，利用 clip-path: polygon() 切出我们想要的形状（一个 8 边形）：</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">当然，上述代码非常容易联想到下述这种 6 边形，使用渐变和 clip-path 都可以轻松得到：</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p><strong>箭头按钮</strong></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">接下来是箭头按钮，仔细观察上面的切角按钮，当两边的角被切掉的足够多的时候，就变成了一个箭头的形状。</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">我们可以利用两重渐变，实现一个单箭头按钮：</span></span></span></p><blockquote><div class=arrow>arrow</div></blockquote><blockquote>&.arrow {<br/> background: linear-gradient(<br/> -135deg,<br/> transparent 22px,<br/> #04e6fb 22px,<br/> #65ff9a 100%<br/> )<br/> top right,<br/> linear-gradient(<br/> -45deg,<br/> transparent 22px,<br/> #04e6fb 22px,<br/> #65ff9a 100%<br/> )<br/> bottom right;<br/> background-size: 100% 50%;<br/> background-repeat: no-repeat;<br/>}</blockquote><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">一个箭头就出来了：</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">它是由上下两个渐变块组合得到的，换个颜色立马就能明白：</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">那如果是这样一个箭头造型呢？</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">一样的，它也是两个渐变的叠加，渐变的颜色是透明 --> 颜色A --> 颜色B --> 透明。当然，同样在这里也可以使用 clip-path：</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">这里给出 clip-path 的解法：</span></span></span></p><blockquote>{<br/> background: linear-gradient(45deg, #04e6fb, #65ff9a);<br/> clip-path: polygon(<br/> 0 0,<br/> 30px 50%,<br/> 0 100%,<br/> calc(100% - 30px) 100%,<br/> 100% 50%,<br/> calc(100% - 30px) 0<br/> );<br/>}</blockquote><p><strong>内切圆角</strong></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">下面这个按钮形状，多出现于优惠券，最常见的解法，也是使用渐变，当然，与切角不同，这里使用的径向渐变。</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">首先，看这样一个简单的例子：</span></span></span></p><blockquote><div></div></blockquote><blockquote>div {<br/> background-image: radial-gradient(circle at 100% 100%, transparent 0, transparent 12px, #2179f5 12px);<br/>}</blockquote><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">可以得到这样一个图形：</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">所以，只需控制下 background-size，在 4 个角实现 4 个这样的图形即可：</span></span></span></p><blockquote><div class=inset-circle>inset-circle</div></blockquote><blockquote>&.inset-circle {<br/> background-size: 70% 70%;<br/> background-image: radial-gradient(<br/> circle at 100% 100%,<br/> transparent 0,<br/> transparent 12px,<br/> #2179f5 13px<br/> ),<br/> radial-gradient(<br/> circle at 0 0,<br/> transparent 0,<br/> transparent 12px,<br/> #2179f5 13px<br/> ),<br/> radial-gradient(<br/> circle at 100% 0,<br/> transparent 0,<br/> transparent 12px,<br/> #2179f5 13px<br/> ),<br/> radial-gradient(<br/> circle at 0 100%,<br/> transparent 0,<br/> transparent 12px,<br/> #2179f5 13px<br/> );<br/> background-repeat: no-repeat;<br/> background-position: right bottom, left top, right top, left bottom;<br/>}</blockquote><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p><strong>借助 mask 实现渐变的内切圆角按钮</strong></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">如果背景色要求渐变怎么办呢？</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">假设我们有一张矩形背景图案，我们只需要使用 mask 实现一层遮罩，利用 mask 的特性，把 4 个角给遮住即可。</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">mask 的代码和上述的圆角切角代码非常类似，简单改造下即可得到渐变的内切圆角按钮：</span></span></span></p><blockquote><div class=mask-inset-circle>inset-circle</div></blockquote><blockquote>.mask-inset-circle {<br/> background: linear-gradient(45deg, #2179f5, #e91e63);<br/> mask: radial-gradient(<br/> circle at 100% 100%,<br/> transparent 0,<br/> transparent 12px,<br/> #2179f5 13px<br/> ),<br/> radial-gradient(<br/> circle at 0 0,<br/> transparent 0,<br/> transparent 12px,<br/> #2179f5 13px<br/> ),<br/> radial-gradient(<br/> circle at 100% 0,<br/> transparent 0,<br/> transparent 12px,<br/> #2179f5 13px<br/> ),<br/> radial-gradient(<br/> circle at 0 100%,<br/> transparent 0,<br/> transparent 12px,<br/> #2179f5 13px<br/> );<br/> mask-repeat: no-repeat;<br/> mask-position: right bottom, left top, right top, left bottom;<br/> mask-size: 70% 70%;<br/>}</blockquote><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">这样，我们就得到了这样一个图形：</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">当然，读懂上述代码，你需要首先弄清楚 CSS mask 属性的原理，如果你对它还有些陌生，可以看看我的这篇文章：</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"><span style="color:#428bca"><a href="https://github.com/chokcoco/iCSS/issues/80" target="_blank">奇妙的 CSS MASK</a></span></span></span></span></p><p><strong>圆角不规则矩形</strong></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">下面这个按钮形状，也是最近被问到最多的，先来看看它的造型：</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">不太好给它起名，一侧是规则的带圆角直角，另外一侧则是带圆角的斜边。</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">其实，它就是由圆角矩形 + 圆角平行四边形组成：</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">所以，借助两个伪元素，可以轻松的实现它们：</span></span></span></p><blockquote><div class=skew>Skew</div></blockquote><blockquote>.skew {<br/> position: relative;<br/> width: 120px;<br/><br/> &::after {<br/> content: ;<br/> position: absolute;<br/> top: 0;<br/> left: 0;<br/> right: 0;<br/> bottom: 0;<br/> border-radius: 10px;<br/> background: orange;<br/> transform: skewX(15deg);<br/> }<br/> &::before {<br/> content: ;<br/> position: absolute;<br/> top: 0;<br/> right: -13px;<br/> width: 100px;<br/> height: 64px;<br/> border-radius: 10px;<br/> background: orange;<br/> }<br/>}</blockquote><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">由于一个伪元素叠加在另外一个之上，所以对其中一个使用渐变，一个则是纯色，其颜色是可以完美衔接在一起的，这样就实现了渐变色的该图形：</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p><strong>外圆角按钮</strong></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">接下来这个按钮形状，常见于 Tab 页上，类似于 Chrome 的分页：</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">我们对这个按钮形状拆解一下，这里其实是 3 块的叠加：</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">只需要想清楚如何实现两侧的弧形三角即可。这里还是借助了渐变 -- 径向渐变，其实他是这样，如下图所示，我们只需要把黑色部分替换为透明即可，使用两个伪元素即可：</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">代码如下：</span></span></span></p><blockquote><div class=outside-circle>outside-circle</div></blockquote><blockquote>.outside-circle {<br/> position: relative;<br/> background: #e91e63;<br/> border-radius: 10px 10px 0 0;<br/><br/> &::before {<br/> content: ;<br/> position: absolute;<br/> width: 20px;<br/> height: 20px;<br/> left: -20px;<br/> bottom: 0;<br/> background: #000;<br/> background:radial-gradient(circle at 0 0, transparent 20px, #e91e63 21px);<br/> }<br/> &::after {<br/> content: ;<br/> position: absolute;<br/> width: 20px;<br/> height: 20px;<br/> right: -20px;<br/> bottom: 0;<br/> background: #000;<br/> background:radial-gradient(circle at 100% 0, transparent 20px, #e91e63 21px);<br/> }<br/>}</blockquote><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">即可得到：</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: center;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px"></span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">上述的所有图形的完整代码，你可以在这里看到：<span style="color:#428bca"><a href="https://codepen.io/Chokcoco/pen/QWMoBGO?editors=1100" target="_blank">CodePen Demo -- CSS Various Button Shapes | CSS 各种造型按钮</a></span></span></span></span></p><p><strong>总结一下</strong></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">基于上述的实现，我们不难发现，一些稍微特殊的按钮，无非都通过拼接、障眼法、遮罩等方式实现。</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">而在其中：</span></span></span></p><ul class=" list-paddingleft-2"><li><p>渐变（线性渐变 linear-gradient、径向渐变 radial-gradient、多重渐变）</p></li><li><p>遮罩 mask</p></li><li><p>裁剪 clip-path</p></li><li><p>变形 transform<br/></p></li></ul><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">发挥了重要的作用，熟练使用它们，我们对于这些图形就可以信手拈来，基于它们的变形也能从容面对。</span></span></span></p><p style="line-height: 30px; text-indent: nullem; text-align: left;"><span style="color:rgb(34, 34, 34)"><span style="font-family:tahoma, arial, "><span style="font-size: 16px">上述的图形，再配合 filter: drop-shadow()，基本都能实现不规则阴影。</span></span></span></p><p><br/></p><link rel="stylesheet" href="//www.zhidianyun.cn/source/plugin/wcn_editor/public/wcn_editor_fit.css?v134_auL" id="wcn_editor_css"/>
页:
[1]