很实用的 轻量纯css多级下拉菜单

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代码中还没有添加注释，不过不难理解。注释稍后添加。
以下是代码：

复制代码代码如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<style type="text/css">
body {
font-family:"宋体";
font-size:12px;
}
.menu {
height:30px;
background:#e6e6e6;
margin-left:10px;
}
.menu a {
text-decoration:none;
}
ul {
margin:0;
padding:0;
}
.menu li {
list-style:none;
float:left;
width:90px;
overflow:visible;
cursor:pointer;
}
ul.level0 {
height:30px;
overflow:visible;
}
ul.level1, ul.level2, ul.level3 {
width:90px;
display:none;
}
ul.level2, ul.level3 {
margin:-28px 0 0 90px;
}
ul.level0 > li {
height:30px;
line-height:30px;
text-align:center;
background:#999;
}
ul.level1 > li, ul.level2 > li, ul.level3 > li {
height:28px;
line-height:28px;
background:#bbb;
}
ul.level0 > li:hover {
background:#ccc;
}
ul.level1 > li:hover, ul.level2 > li:hover, ul.level3 > li:hover {
background:#ddd;
}
ul.level0 > li.imyeah:hover > ul, ul.level1 > li.imyeah:hover > ul, ul.level2 > li.imyeah:hover > ul, ul.level3 > li.imyeah:hover > ul {
display:block;
}
</style>
</head>
<body>
<div class="menu">
<ul class="level0">
<li class="imyeah"> <a href="">immenu0</a>
<ul class="level1">
<li> <a href="">imdropmenu00</a> </li>
<li class="imyeah"> <a href="">imdropmenu01</a>
<ul class="level2">
<li class="imyeah"> <a href="">imdropmenu010</a>
<ul class="level3">
<li> <a href="">imdropmenu0100</a> </li>
<li> <a href="">imdropmenu0101</a> </li>
</ul>
</li>
<li> <a href="">imdropmenu011</a> </li>
<li> <a href="">imdropmenu012</a> </li>
</ul>
</li>
<li> <a href="">imdropmenu02</a> </li>
<li> <a href="">imdropmenu03</a> </li>
<li> <a href="">imdropmenu04</a> </li>
</ul>
</li>
<li class="imyeah"> <a href="" class="top_link">immenu1</a>
<ul class="level1">
<li class="imyeah"> <a href="">imdropmenu10</a>
<ul class="level2">
<li> <a href="">imdropmenu100</a> </li>
<li class="imyeah"> <a href="">imdropmenu101</a>
<ul class="level3">
<li> <a href="">imdropmenu1010</a> </li>
<li> <a href="">imdropmenu1011</a> </li>
</ul>
</li>
<li> <a href="">imdropmenu102</a> </li>
</ul>
</li>
<li> <a href="">imdropmenu11</a> </li>
<li> <a href="">imdropmenu12</a> </li>
<li> <a href="">imdropmenu13</a> </li>
<li> <a href="">imdropmenu14</a> </li>
<li> <a href="">imdropmenu15</a> </li>
</ul>
</li>
<li class="imyeah"> <a href="" class="top_link">immenu2</a>
<ul class="level1">
<li> <a href="">imdropmenu20</a> </li>
<li> <a href="">imdropmenu21</a> </li>
</ul>
</li>
<li class="imyeah"> <a href="" class="top_link">immenu3</a>
<ul class="level1">
<li> <a href="">imdropmenu30</a> </li>
<li> <a href="">imdropmenu31</a> </li>
<li> <a href="">imdropmenu32</a> </li>
</ul>
</li>
<li> <a href="" class="top_link">immenu4</a> </li>
</ul>
</div>
</body>
</html>

效果图如下：


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