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dropdown-css.html
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<!DOCTYPE html>
<html>
<head>
<meta content="text/html; charest=utf-8;">
<title>dropdown-css</title>
</head>
<style type="text/css">
/*IE的position:absolute会发生错位*/
*{padding: 0}
ul{list-style: none;border: 1px solid #ccc;}
a{text-decoration: none;}
a:link{color: black;}
a:hover{color:red;}
.first,.first>li{float: left;border-right: 1px solid #ccc;text-align: center;}/*>选择直接子元素*/
.first:last-child{border-right: 0}/*IE不支持*/
li{padding: 10px;width: 100px;height: 20px;text-align: left;}
.second,.third{display: none;position: absolute;background: #fff;}
.second{margin-left: -11px;margin-top: 12px;}
.third{margin-left: 105px;margin-top: -23px;}
.first-li:hover{background: #ccc;}
.first-li:hover .second{display: block;}
.second:hover,.second-li:hover .third{display: block;}
.has-child>a:after{content: "\00BB"; float: right;}
</style>
<body>
<nav>
<ul class="first">
<li class="first-li"><a href="">第一层第1个</a>
<ul class="second">
<li class="second-li has-child"><a href="">1.1</a>
<ul class="third">
<li><a href="">1.1.1</a></li>
<li><a href="">1.1.2</a></li>
<li><a href="">1.1.3</a></li>
</ul>
</li>
<li class="second-li"><a href="">1.2</a></li>
<li class="second-li has-child"><a href="">1.3</a>
<ul class="third">
<li><a href="">1.3.1</a></li>
<li><a href="">1.3.2</a></li>
<li><a href="">1.3.3</a></li>
</ul>
</li>
</ul>
</li>
<li class="first-li"><a href="">第一层第2个</a>
<ul class="second">
<li><a href="">2.1</a></li>
<li><a href="">2.2</a></li>
<li><a href="">2.3</a></li>
</ul>
</li>
<li class="first-li"><a href="">第一层第3个</a>
<ul class="second">
<li><a href="">3.1</a></li>
<li><a href="">3.2</a></li>
<li><a href="">3.3</a></li>
</ul>
</li>
<li class="first-li"><a href="">第一层第4个</a>
<ul class="second">
<li><a href="">4.1</a></li>
<li><a href="">4.2</a></li>
<li><a href="">4.3</a></li>
</ul>
</li>
</ul>
</nav>
</body>
</html>