纯JS实现的简单tab选项卡切换效果

本人在上一篇文章也写了用JS来实现tab选项卡切换效果，但是上次的那个代码比较复杂，这次是简化版的。
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Tab效果</title>
	<style type="text/css">
		ul{
			list-style: none;
		}
		*{
			margin: 0;
			padding: 0;
		}
		#tab{
			border: 1px solid #ccc;
			margin: 20px auto;
			width: 403px;
			border-top: none;
		}
		.list ul{
			overflow: hidden;
		}
		.list li{
			float: left;
		}
		.list li{
			padding-left: 28px;
			padding-right: 28px;
			padding-top: 6px;
			padding-bottom: 6px;
			border: 1px solid #ccc;
			background: -moz-linear-gradient(top, #FEFEFE, #EDEDED);
			background:-webkit-gradient(linear,left top,left bottom, from(#fefefe), to(#ededed));
			border-right: none;
			cursor: pointer;
		}
		#listCon{
			height: 100px;
		}
		#listCon div{
			padding:10px;
			position:absolute;
			opacity:0;
			filter:alpha(opacity=0);
		}
		.list li:first-child{
			border-left: none;
		}
		.list li:hover{
			background: #fff;
			border-bottom: none;
		}
		.list li.cur{
			background: #fff;
			border-bottom: none;
		}
		#listCon div.cur{
			opacity:1;
			filter:alpha(opacity=100);
		}
	</style>
</head>
<body>
	<div id="tab">
		<div class="list">
			<ul>
				<li class="cur">许嵩</li>
				<li>周杰伦</li>
				<li>林俊杰</li>
				<li>陈奕迅</li>
			</ul>
		</div>
		<div id="listCon">
			<div class="cur">断桥残雪、千百度、幻听、想象之中</div>
			<div>红尘客栈、牛仔很忙、给我一首歌的时间、听妈妈的话</div>
			<div>被风吹过的夏天、江南、一千年以后</div>
			<div>十年、K歌之王、浮夸</div>
		</div>
	</div>
	<script type="text/javascript">
		window.onload = function(){
			var oDiv = document.getElementById("tab");
			var lis = oDiv.getElementsByTagName("li");
			var oDivCon = document.getElementById("listCon");
			var lisDiv = oDivCon.getElementsByTagName("div");			
			for(var i=0;i<lis.length;i++){
				lis[i].index = i;
				lis[i].onmouseover = function(){
					show(this.index);
				}
			}
			function show(a){
				for(var j=0;j<lis.length;j++){
					lis[j].className = "";
					lisDiv[j].className = "";					
				}
				lis[a].className = "cur";
				lisDiv[a].className = "cur";
			}
		}
	</script>
</body>
</html>
纯JS实现的简单tab选项卡切换效果

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