<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>下拉菜单(无限级)</title>
<style>
*{
padding: 0;
margin: 0;
}
li{
list-style-type: none;
}
body{
margin: 50px;
}
.hide{
display: none;
}
.menu{
cursor: pointer;
}
</style>
</head>
<body>
<ul>
<li class="menu" style="float: left;">
<span>一级菜单</span>
<ul class="hide">
<li class="menu">
<span>二级菜单</span>
<ul class="hide">
<li class="menu">
<span>三级菜单</span>
<ul class="hide">
<li class="menu">
<span>四级菜单</span>
<ul class="hide">
<li class="menu"><span>五级菜单</span></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li class="menu" style="float: left;">
<span>一级菜单</span>
<ul class="hide">
<li class="menu">
<span>二级菜单</span>
<ul class="hide">
<li class="menu">
<span>三级菜单</span>
<ul class="hide">
<li class="menu">
<span>四级菜单</span>
<ul class="hide">
<li class="menu"><span>五级菜单</span></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
<script src="jquery.js"></script>
<script>
$(function(){
var menu = $('.menu');
menu.hover(function(){
$(this).children('ul').show();
},function(){
$(this).children('ul').hide();
});
});
</script>
</body>
</html>
效果图：
