微博导航看起来很美观，实现起来也不麻烦，直接写代码了
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<script type="text/javascript">
var hiddenChild = function(obj) {
var ul = obj.getElementsByTagName("ul")[0];
ul.style.display = ‘none‘;
}
/*
*obj表示导航条中的直接li
*/
var showChild = function(obj) {
var ul = obj.getElementsByTagName("ul")[0];
ul.style.display = ‘block‘;
}
</script>
<style type="text/css">
* {
margin: 0px;
padding: 0px
}
/*导航条*/
#nav {
line-height: 60px;
list-style-type: none;
background-color: #0000FF;
text-align: center;
}
#nav a {
color: white;
text-decoration: none;
display: block;
width: 80px;
font-size: 20px;
font-weight: 800;
}
#nav a:hover {
background-color: #ccc;
}
#nav li {
background-color: blue;
float: left;
color: white;
list-style-type: none;
}
#nav li ul {
position: absolute;
display: none;
width: 130px;
}
.show {
display: block;
}
</style>
</head>
<body>
<ul id="nav">
<li onmouseover="showChild(this);" onmouseleave="hiddenChild(this);">
<a href="#">首页</a>
<ul>
<li>
<a href="#">全部广播</a>
</li>
<li>
<a href="#">好友</a>
</li>
<li>
<a href="#">关注</a>
</li>
</ul>
</li>
<li onmouseover="showChild(this);" onmouseleave="hiddenChild(this);">
<a href="#">微频道</a>
<ul>
<li>
<a href="#">微频道1</a>
</li>
<li>
<a href="#">微频道2</a>
</li>
</ul>
</li>
<li onmouseover="showChild(this);" onmouseleave="hiddenChild(this);">
<a href="#">找人</a>
<ul>
<li>
<a href="#">明星</a>
</li>
<li>
<a href="#">达人</a>
</li>
</ul>
</li>
<li onmouseover="showChild(this);" onmouseleave="hiddenChild(this);">
<a href="#">微群</a>
<ul>
<li>
<a href="#">股票</a>
</li>
</ul>
</li>
</ul>
</body>
</html>
以上代码就是用js实现微博导航栏，需要的朋友可以来参考下。
原文：http://www.jb51.net/article/70315.htm