Tab选项卡
采用两种方法实现选项卡切换功能，目前只提供了最基本的切换效果，后期增加jquery版和渐变切换效果。
效果图：
纯JS简化版：
<html>
<head>
<title>Tab选项卡 - 纯JS简化版</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<style type="text/css">
#btn { 500px; height: 30px; margin:0;padding: 0; list-style: none;}
#btn li { cursor: pointer; float: left; 100px; height: 30px; margin-right: 2px; background: #666; color:#fff; text-align: center; line-height: 30px;}
#btn li.onbtn {background: #f00;}
#tabs div {display: none; 500px; height: 100px; border: 1px solid #ccc;}
</style>
<script type="text/javascript">
window.onload = function() {
var btn = document.getElementById('btn');
var btnli = btn.getElementsByTagName('li');
var tabs = document.getElementById('tabs');
var tabsdiv = tabs.getElementsByTagName('div');
for (var a=0; a<btnli.length; a++) {
btnli[a].index=a;
btnli[a].onmouseover = function() {
for (var b=0; b<tabsdiv.length; b++) {
btnli[b].className = "";
tabsdiv[b].style.display = "none";
}
this.className = "onbtn";
tabsdiv[this.index].style.display = "block";
}
}
btnli[0].className = "onbtn";
tabsdiv[0].style.display = "block";
}
</script>
<body>
<div>
<ul id="btn">
<li>选项一</li>
<li>选项二</li>
<li>选项三</li>
</ul>
<div id="tabs">
<div>选项一内容</div>
<div>选项二内容</div>
<div>选项三内容</div>
</div>
</div>
</body>
</html>
纯JS面向对象版：
<html>
<head>
<title>纯JS - 面向对象版</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head>
<style type="text/css">
#btn, #btn2 { 500px; height: 30px; margin:0;padding: 0; list-style: none;}
#btn li, #btn2 li { cursor: pointer; float: left; 100px; height: 30px; margin-right: 2px; background: #666; color:#fff; text-align: center; line-height: 30px;}
#btn li.onbtn, #btn2 li.onbtn {background: #f00;}
#tabs div, #tabs2 div {display: none; 500px; height: 100px; border: 1px solid #ccc; margin-bottom:10px;}
</style>
<script type="text/javascript">
function tab(btn, tabs) {
var _this = this;
var btn = document.getElementById(btn);
var tabs = document.getElementById(tabs);
this.btnli = btn.getElementsByTagName('li');
this.tabsdiv = tabs.getElementsByTagName('div');
for (var a=0; a<this.btnli.length; a++) {
this.btnli[a].index = a;
this.btnli[a].onmouseover = function() {
_this.onmouseoverfn(this);
}
}
this.tabsdiv[0].style.display = "block";
this.btnli[0].className = "onbtn";
}
tab.prototype.onmouseoverfn = function(obj) {
for (var b=0; b<this.btnli.length; b++) {
this.tabsdiv[b].style.display = "none";
this.btnli[b].className = "";
}
this.tabsdiv[obj.index].style.display = "block";
this.btnli[obj.index].className = "onbtn";
}
window.onload = function() {
new tab('btn', 'tabs');
new tab('btn2', 'tabs2');
}
</script>
<body>
<div>
<ul id="btn">
<li>选项一</li>
<li>选项二</li>
<li>选项三</li>
</ul>
<div id="tabs">
<div>选项一内容</div>
<div>选项二内容</div>
<div>选项三内容</div>
</div>
</div>
<div>
<ul id="btn2">
<li>选项一</li>
<li>选项二</li>
<li>选项三</li>
</ul>
<div id="tabs2">
<div>选项一内容</div>
<div>选项二内容</div>
<div>选项三内容</div>
</div>
</div>
</body>
</html>