原生tab切换

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>选项卡</title>
<style type="text/css">
.main {width:400px; margin:0 auto;}
#title {height:30px; line-height:30px;}
#title span {float:left; width:120px; height:30px; margin-right:5px; color:#333; background:#eee; text-align:center; cursor:pointer; font-weight:bold;}
#title span.on {background:#333; color:#fff;}
#con {background:#fafafa; height:200px; border-top:2px solid #333;}
#con ul {display:none; padding:10px;}
#con ul.on {display:block;}
#con ul li {height:24px; line-height:24px; border-bottom:1px dotted #ccc; text-indent:10px;}
</style>

</head>
<body>
<div class="wrapper">
<h1>原生javascript效果：选项卡切换</h1>
<div class="main">
<h4 id="title">
<span class="on">jquery</span>
<span>javascript</span>
<span>css</span>
</h4>
<div id="con">
<ul class="on">
<li><a href="#">jquery选项卡</a></li>
<li><a href="#">jquery焦点图</a></li>
<li><a href="#">jquery表单验证</a></li>
<li><a href="#">jquery特效</a></li>
</ul>
<ul>
<li><a href="#">原生javascript</a></li>
<li><a href="#">javascript特效</a></li>
<li><a href="#">javascript笔记</a></li>
</ul>
<ul>
<li><a href="#">css sprites</a></li>
<li><a href="#">css命名规则</a></li>
<li><a href="#">css font属性</a></li>
<li><a href="#">css background属性</a></li>
</ul>
</div>
</div>
</div>
<script type="text/javascript">
var oTitle = document.getElementById('title');
var aSpan = oTitle.getElementsByTagName('span');
var oCon = document.getElementById('con');
var aUl = oCon.getElementsByTagName('ul');
var i = 0;
for(i=0; i<aSpan.length; i++) {
aSpan[i].index = aUl[i].index = i;
aSpan[i].onclick = function () {
for(i=0; i<aSpan.length; i++) {
aSpan[i].className = '';
aUl[i].className = '';
}
this.className = 'on';
aUl[this.index].className = 'on';
}
}
</script>
</body>
</html>