前端ABC在开发移动端项目时，总是遇到很多小三角，之前一直用图片，感觉好麻烦，今天尝试了直接用CSS写出小三角！
先看看如何写出各种小三角！
<!DOCTYPE HTML>
<html lang="en-US">
<head>
<meta charset="UTF-8">
<title>qdabc.cn</title>
<style type="text/css">
div{ margin-bottom:20px;}
/*箭头向上*/
.arrow-up {
width:0;
height:0;
border-left:30px solid transparent;
border-right:30px solid transparent;
border-bottom:30px solid #000;
}
/*箭头向下*/
.arrow-down {
width:0;
height:0;
border-left:30px solid transparent;
border-right:30px solid transparent;
border-top:30px solid #000;
}
/*箭头向左*/
.arrow-left {
width:0;
height:0;
border-top:30px solid transparent;
border-bottom:30px solid transparent;
border-right:30px solid #000;
}
/*箭头向右*/
.arrow-right {
width:0;
height:0;
border-top:30px solid transparent;
border-bottom: 30px solid transparent;
border-left: 30px solid #000;
}
.box{ width:300px; height:300px; background:#838383; position:relative;}
.box:after{
position:absolute;
right:-20px;
top:10px;
display:block;
content:"";
width:0;
height:0;
border-top:20px solid transparent;
border-bottom: 20px solid transparent;
border-left: 20px solid #838383;
}
</style>
</head>
<body>
<div class="arrow-up">
<!--向上的三角-->
</div>
<div class="arrow-down">
<!--向下的三角-->
</div>
<div class="arrow-left">
<!--向左的三角-->
</div>
<div class="arrow-right">
<!--向右的三角-->
</div>
<div class="box">
:after 伪元素在元素之后添加内容实现小三角
</div>
</body>
</html>
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