源代码：
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<script type="text/javascript" src="js/jquery-2.1.0.min.js" ></script>
<title>Document</title>
<style>
.box {
font-size: 14px;
list-style: none;
margin: 15px auto;
padding: 0px;
width: 1000px;
color: white;
}
.box li {
font-size: 14px;
float: left;
width: 200px;
height: 35px;
line-height: 35px;
text-align: center;
cursor: pointer;
background: #333;
}
.box li .pox {
list-style: none;
margin: 0px;
padding: 0px;
display: none;
color: red;
}
.box li .pox li{
background: blueviolet;
}
</style>
<script>
$(function(){
$('.box li').hover(function(){
$(this).find('.pox').slideDown('normal');
},function(){
$(this).find('.pox').stop().slideUp('normal');
});
})
</script>
</head>
<body>
<ul class="box">
<li>导航列表1
<ul class="pox">
<li> 导航列表11</li>
<li>导航列表11</li>
<li>导航列表11</li>
<li>导航列表11</li>
<li>导航列表11</li>
</ul>
</li>
<li>导航列表2
<ul class="pox">
<li>导航列表22</li>
<li>导航列表22</li>
<li>导航列表22</li>
<li>导航列表22</li>
<li>导航列表22</li>
</ul>
</li>
<li>导航列表3
<ul class="pox">
<li>导航列表33</li>
<li>导航列表33</li>
<li>导航列表33</li>
<li>导航列表33</li>
<li>导航列表33</li>
</ul>
</li>
<li>导航列表4
<ul class="pox">
<li>导航列表44</li>
<li>导航列表44</li>
<li>导航列表44</li>
<li>导航列表44</li>
<li>导航列表44</li>
</ul>
</li>
<li>导航列表5
<ul class="pox">
<li>导航列表55</li>
<li>导航列表55</li>
<li>导航列表55</li>
<li>导航列表55</li>
<li>导航列表55</li>
</ul>
</li>
</ul>
</body>
</html>
三级下拉菜单
<!DOCTYPE html >
<html>
<head>
<meta charset="utf-8" />
<title>CSS样式三级下拉菜单</title>
<style>
@charset "utf-8";
body{margin:0px; padding:0px; font-family:Verdana, Geneva, sans-serif;background: wheat;font-size:12px; color:#FFF;}
body a{color:red;}
.box{margin:13px auto; padding:0px; width:1000px;}
.box ul{margin:0px; padding:0px; list-style:none;}
.box ul li{margin:0px 2px 0px 0px; padding:0px; width:120px; height:35px; display:inline; float:left;; border-radius:4px; box-shadow:#000 0px 0px 1px;}
.box ul li:hover ul{display:block;}
.box ul li a{text-align:center; width:121px; height:37px; line-height:35px; display:block; text-decoration:none;}
.box ul li ul{display:none;}
.box ul li ul li{margin:0px 0px 2px 0px; padding:0px; background:blue;}
.box ul li ul li:hover{background:green;}
.box ul li ul li:hover ul{visibility:visible;}
.box ul li ul li ul{visibility:hidden; position:relative; top:-37px; left:121px;}
.box ul li ul li ul li{background:white;}
.box ul li ul li ul li:hover{background:yellow;}
</style>
</head>
<body>
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