<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>横向菜单</title>
<script type="text/javascript" src="jquery-1.8.3.min.js"></script>
<style type="text/css">
*{
padding: 0px;
margin: 0px;
}
h3{
width:200px;
height:30px;
margin-top:10px;
background-color:#ccc;
}
ul{
display: none;
}
li{
list-style-type:none;
width:200px;
height:30px;
line-height:30px;
text-align:center;
border-bottom:1px dashed red;
background-color:green;
}
</style>
</head>
<body>
<h3>我的京东</h3>
<ul>
<li>111</li>
<li>111111111</li>
<li>111111</li>
<li>111</li>
</ul>
<h3>我的京东1</h3>
<ul>
<li>222</li>
<li>222</li>
<li>222</li>
<li>222</li>
</ul>
<h3>我的京东2</h3>
<ul>
<li>333</li>
<li>333</li>
<li>333</li>
<li>333</li>
</ul>
</body>
<script type="text/javascript">
//JQuery 入口文件 起到兼容作用
$(function(){
$("h3").mousemove(function(){
$(this).next("u1").slideToggle(2000);
});
})
</script>
</html>
原文：http://www.cnblogs.com/kevin-yang520/p/7076643.html