一个简单的tab切换功能，直接上代码：
<!DOCTYPE html>
<html>
<head>
<meta Charset="UTF-8">
<script type="text/javascript" src="/demo/js/jq.js"></script>
<script type="text/javascript">
$(function(){
$("#tab li").click(function(){
var idx=$("#tab li").index(this);
$(this).addClass("on").siblings().attr("class","");
$("#tab_con").children(":eq("+idx+")").show().siblings().hide();
})
})
</script>
<style type="text/css">
#box{padding: 20px;font-size:12px}
#box ul{margin:0;padding:0;list-style:none}
#tab{height:25px; padding-left: 10px;border-bottom:1px solid #aacbee; }
#tab li{width:80px;height:18px;padding-top:7px;margin-right:10px;text-align:center;float:left;background:#F3F8FD;cursor:pointer}
#tab li:hover{color:#ca4e00; font-weight:bold;}
#tab li.on{width:78px;height:19px;padding-top:5px;border:1px solid #AACBEE;border-bottom:none;color:#00f;background:#E8F2F7;position:relative;top:1px; color:#CA4E00; font-weight:bold;}
#tab_con{border-top:none;padding:10px 20px 20px 20px;}
#tab_con .off{display:none;}
</style>
</head>
<body>
<div id="box">
<ul id="tab">
<li>Home</li>
<li>Product</li>
<li>About</li>
</ul>
<ul id="tab_con">
<li>Home Content</li>
<li>Product Content</li>
<li>About Content</li>
</ul>
</div>
</body>
</html> 
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