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index5.html
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<!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>
<title>111</title>
<style type="text/css">
.top-nav {
font-size: 12px;
font-weight: bold;
list-style: none;
}
.top-nav li {
float: left;
list-style: none;
margin-right: 1px;
}
.top-nav li a {
line-height: 20px;
text-decoration: none;
background: #DDDDDD;
color: #666666;
display: block;
width: 80px;
text-align: center;
}
.top-nav li a:hover {
background: #900;
color: #FFF;
}
.top-nav ul {
list-style: none;
display: none;
width: 80px;
padding: 0;
position: relative;
}
.top-nav li ul li ul {
position: absolute;
top: 0;
left: 80px;
}
/* 使用CSS设置鼠标移动到一级菜单时，二级菜单显示，三级菜单隐藏 */
.top-nav li:hover ul {
display: block;
}
.top-nav li:hover ul li ul {
display: none;
}
/* 使用CSS设置鼠标移动到二级菜单时，三级菜单显示 */
.top-nav li ul li:hover ul {
display: block;
}
</style>
<script type="text/javascript">
window.onload = function () {
//判断是否为IE浏览器
var isIE = !!window.ActiveXObject;
var isIE6 = isIE && !window.XMLHttpRequest;
if (isIE6) {
var Lis = document.getElementsByTagName("li");
for (var i = 0; i < Lis.length; i++) {
Lis[i].onmouseover = function () {
var u = this.getElementsByTagName("ul")[0];
//如果包含子菜单，就将子菜单显示
if (u != undefined) {
u.style.display = "block";
}
}
Lis[i].onmouseout = function () {
var u = this.getElementsByTagName("ul")[0];
//如果包含子菜单，就将子菜单隐藏
if (u != undefined) {
u.style.display = "none";
}
}
}
}
}
</script>
</head>
<body>
<ul class="top-nav">
<li>
<a href="#">慕课网首页</a>
<ul>
<li>
<a href="#">前端课程 +</a>
<ul>
<li>
<a href="#">javascript</a>
</li>
<li>
<a href="#">css</a>
</li>
<li>
<a href="#">jquery</a>
</li>
</ul>
</li>
<li>
<a href="#">手机开发</a>
<ul>
<li>
<a href="#">ios开发</a>
</li>
<li>
<a href="#">android开发</a>
</li>
<li>
<a href="#">WP开发</a>
</li>
</ul>
</li>
<li>
<a href="#">后台编程</a>
</li>
</ul>
</li>
<li>
<a href="#">课程大厅</a>
</li>
<li>
<a href="#">学习中心 +</a>
<ul>
<li>
<a href="#">前端课程 +</a>
<ul>
<li>
<a href="#">javascript</a>
</li>
<li>
<a href="#">css</a>
</li>
<li>
<a href="#">jquery</a>
</li>
</ul>
</li>
<li>
<a href="#">手机开发</a>
<ul>
<li>
<a href="#">ios开发</a>
</li>
<li>
<a href="#">android开发</a>
</li>
<li>
<a href="#">WP开发</a>
</li>
</ul>
</li>
<li>
<a href="#">后台编程</a>
</li>
</ul>
</li>
<li>
<a href="#">关于我们</a>
</li>
</ul>
</body>
</html>