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CSS中三角形在网页中比较常见，以前是图片，不过现在基本上都是通过CSS可以完成，实现比较简单，我们可以看一组简单的三角形效果:
其实实现起来比较简单，通过空div然后设置宽高为0，之后可以四周border的宽度，控制三角形的形状，四个border可以看成是两横横竖的木头的重叠的效果，两横在两竖上面，三角形就是中间重叠的部分切分出来的,样式的代码如下:
.triangle {
width: 0;
height: 0;
border-top: 20px solid #EEB422;
border-right: 20px solid #C0FF3E;
border-bottom: 20px solid #A020F0;
border-left: 20px solid #7CFC00;
}
.triangle-up {
width: 0;
height: 0;
border-right: 20px solid transparent;
border-bottom: 40px solid #A020F0;
border-left: 20px solid transparent;
}
.triangle-down {
width: 0;
height: 0;
border-top: 40px solid #EEB422;
border-right: 20px solid transparent;
border-left: 20px solid transparent;
}
.triangle-left {
width: 0;
height: 0;
border-top: 20px solid transparent;
border-bottom: 20px solid transparent;
border-left: 40px solid #7CFC00;
}
.triangle-right {
width: 0;
height: 0;
border-top: 20px solid transparent;
border-bottom: 20px solid transparent;
border-right: 40px solid #C0FF3E;
}
.triangle-left-bottom {
width: 0;
height: 0;
border-top: 40px solid transparent;
border-left: 40px solid #7CFC00;
}
.triangle-right-bottom {
width: 0;
height: 0;
border-top: 40px solid transparent;
border-right: 40px solid #C0FF3E;
}
具体的html页面代码:
<div class="row">
<span>四个三角</span>
<div class="triangle">
</div>
</div>
<div class="row">
<span>上三角</span>
<div class="triangle-up">
</div>
</div>
<div class="row">
<span>下三角</span>
<div class="triangle-down">
</div>
</div>
<div class="row">
<span>左三角</span>
<div class="triangle-left">
</div>
</div>
<div class="row">
<span>右三角</span>
<div class="triangle-right">
</div>
</div>
<div class="row">
<span>左下角</span>
<div class="triangle-left-bottom">
</div>
</div>
<div class="row">
<span>右下角</span>
<div class="triangle-right-bottom">
</div>
</div>
参考：
http://www.tuicool.com/articles/qYjaMjA
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原文地址：http://www.cnblogs.com/yjstonestar/p/CSS.html
