<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<script>
window.onload = function(){
function tab(obj){
var target = document.getElementById(obj);
var spans = target.getElementsByTagName("span");
var lis = target.getElementsByTagName("li");
for(var i=0; i < spans.length; i++){
spans[i].index = i;
spans[i].onmouseover = function(){
for(var j=0; j<spans.length;j++){
spans[j].className="";
lis[j].className = "";
}
this.className="current";
lis[this.index].className ="show";
}
}
}
tab("one");
tab("tow");
tab("third")
}
</script>
<style>
*{
margin: 0;
padding: 0;
}
ul{
list-style: none;
}
.box{
width: 340px;
height: 300px;
border: 1px solid #ccc;
margin: 100px auto;
}
.mt span{
display: inline-block;
width: 80px;
height: 30px;
background-color: pink;
text-align: center;
line-height: 30px;
cursor: pointer;
}
.mb li{
width: 100%;
height: 270px;
background-color: purple;
display: none;
}
.mt span.current{
background-color: purple;
}
.mb li.show{
display: block;
}
</style>
</head>
<body>
<div class="box" id="one">
<div class="mt">
<span class="current">新闻</span>
<span>体育</span>
<span>娱乐</span>
<span>八卦</span>
</div>
<div class="mb">
<ul>
<li class="show">新闻</li>
<li>体育</li>
<li>娱乐</li>
<li>八卦</li>
</ul>
</div>
</div>
<div class="box" id="tow">
<div class="mt">
<span class="current">新闻</span>
<span>体育</span>
<span>娱乐</span>
<span>八卦</span>
</div>
<div class="mb">
<ul>
<li class="show">新闻</li>
<li>体育</li>
<li>娱乐</li>
<li>八卦</li>
</ul>
</div>
</div>
<div class="box" id="third">
<div class="mt">
<span class="current">新闻</span>
<span>体育</span>
<span>娱乐</span>
<span>八卦</span>
</div>
<div class="mb">
<ul>
<li class="show">新闻</li>
<li>体育</li>
<li>娱乐</li>
<li>八卦</li>
</ul>
</div>
</div>
</body>
</html>
通过传递盒子的id，对不同盒子的tab进行特效操作。鼠标通过不同的span标签时，显示不同的内容。
原文：http://www.cnblogs.com/jiang-z/p/7468607.html