<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script type="text/javascript" src="js/jquery-1.8.3.min.js"></script>
<style>
.active{
border-bottom: 3px solid #4b4;
}
ul{
height:80px;
border: 1px solid #ddd;
font-size:0;
}
ul li{
display: inline-block;
height:50px;
90px;
text-align: center;
line-height: 50px;
color:#333;
border-bottom: 3px solid #ccc;
margin: 0px;
padding: 0px;
font-size:16px;
font-family: "Microsoft YaHei",sans-serif;
}
</style>
<script>
$(function(){
var lis=$("li");
$.each(lis,function(i){
$(lis[i]).mouseenter(function(e){
$(".active").removeClass('active');
$(this).addClass('active');
});
});
});
</script>
</head>
<body>
<ul>
<li class="active">首页</li>
<li>第一页</li>
<li>第二页</li>
<li>第三页</li>
</ul>
</body>
</html>