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简洁的代码实现选项卡切换效果：<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
*{margin:0;padding:0}
.notice{
height:98px;
width:298px;
border:1px solid #eee;
overflow:hidden;
}
.notice-tit{
height:27px;
position:relative;
}
.notice-tit ul{
list-style:none;
position:absolute;
width:301px;
left:-1;
}
.notice-tit ul li{
float:left;
width:58px;
height:26px;
padding:0 1px;
text-align:center;
line-height:26px;
overflow:hidden;
background:#F7F7F7;
border-bottom:1px solid #eee;
}
.notice-tit ul li.select{
background:#fff;
border-bottom-color:#fff;
border-left:1px solid #eee;
border-right:1px solid #eee;
padding:0;
}
.notice ul li a:link,.notice ul li a:visited{
text-decoration:none;
color:#000;
}
.notice ul li a:hover{
color:#f90;
}
.notice-con .mod{
margin:10px 15px;
}
.notice-con .mod ul li{
float:left;
width:134px;
height:25px;
overflow:hidden;
}
</style>
<script>
function $(id){
return typeof id === 'string'?document.getElementById(id):id;
}
window.onload = function(){
//获取鼠标滑过或点击的标签和要切换内容的元素
var titles=$('notice-tit').getElementsByTagName('li');
divs=$('notice-con').getElementsByTagName('div');
if(titles.length != divs.length)
return;
//遍历titles下的所有li
for(var i=0;i<titles.length;i++){
titles[i].id=i;
titles[i].onmouseover=function(){
//清除li上的class
for(var j=0;j<titles.length;j++){
titles[j].className='';
divs[j].style.display = 'none';
}
//设置当前高亮显示
this.className='select';
divs[this.id].style.display = 'block';
}
}
}
</script>
</head>
<body>
<div id="notice" class="notice">
<div id="notice-tit" class="notice-tit">
<ul>
<li class="select"><a href="#">简介</a></li>
<li><a href="#">简介</a></li>
<li><a href="#">简介</a></li>
<li><a href="#">简介</a></li>
<li><a href="#">简介</a></li>
</ul>
</div>
<div id="notice-con" class="notice-con" >
<div class="mod" style="display:block">
<ul>
<li><a href="#">编写菜单效果1</a></li>
<li><a href="#">编写菜单效果</a></li>
<li><a href="#">编写菜单效果</a></li>
<li><a href="#">编写菜单效果</a></li>
</ul>
</div>
<div class="mod" style="display:none">
<ul>
<li><a href="#">编写菜单效果2</a></li>
<li><a href="#">编写菜单效果</a></li>
<li><a href="#">编写菜单效果</a></li>
<li><a href="#">编写菜单效果</a></li>
</ul>
</div>
<div class="mod" style="display:none">
<ul>
<li><a href="#">编写菜单效果3</a></li>
<li><a href="#">编写菜单效果</a></li>
<li><a href="#">编写菜单效果</a></li>
<li><a href="#">编写菜单效果</a></li>
</ul>
</div>
<div class="mod" style="display:none">
<ul>
<li><a href="#">编写菜单效果4</a></li>
<li><a href="#">编写菜单效果</a></li>
<li><a href="#">编写菜单效果</a></li>
<li><a href="#">编写菜单效果</a></li>
</ul>
</div>
<div class="mod" style="display:none">
<ul>
<li><a href="#">编写菜单效果5</a></li>
<li><a href="#">编写菜单效果</a></li>
<li><a href="#">编写菜单效果</a></li>
<li><a href="#">编写菜单效果</a></li>
</ul>
</div>
</div>
</div>
</body>
</html>
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原文地址：http://blog.csdn.net/yzi_angel/article/details/47132691
