js实现tab切换效果

效果如下：

代码如下：

<!DOCTYPE html >
<html>
<head>
<meta charset="utf-8" />
<title>js封装一个tab效果</title>
<style type="text/css">
*{margin:0; padding:0;}
body { font:12px/1.8 Arial; color:#666;}
.wrapper { width:500px; border:1px solid #e6e6e6; margin:0 auto; padding:50px;}
/*--=tabPanel--*/
#tab{border:1px solid #ccc;}
#tab .tab-bd{border-top:none;margin:0 auto;padding:10px;text-align:left;height:120px;position:relative}
.tab-nav{margin:0 auto;padding:0;background:#eee;height:26px;}
.tab-nav li{display:inline;list-style:none outside none;width:90px;height:26px;float:left;line-height:26px;text-align:center;}
.tab-nav li a{color:#555;display:inline-block}
.tab-nav li a:hover,.tab-nav li.hover a{text-decoration:none;background:#fff;color:#000;display:block; }
.hidden{display:none}
</style>
<script type="text/javascript">
function tabPanel(param){
 var defaultIndex=param["default"]||0,//设置显示的页面
 panelobj=param["panel"],//设置tab容器
 defalutClass=param["defalutStyle"]||"",//设置tab菜单项的普通样式
 hoverClass=param["hoverStyle"]||"hover",//设置鼠标移到tab菜单项的样式
 currentIndex=defaultIndex,
 menus=_$(panelobj).getElementsByTagName("ul")[0].getElementsByTagName("li"),
 contents=_$(panelobj).getElementsByTagName("ul")[1].getElementsByTagName("li"),
 menuNumber=menus.length,
 hidden="hidden";
 for(var i=0;i<menuNumber;i++){
 _setClass(contents[0],hoverClass);
 _setClass(contents[i],hidden);
 _setClass(menus[i],defalutClass);
 (function(i){
  menus[i].onmouseover=function(){
  var old=menus[currentIndex];
  _setClass(old,defalutClass);
  _setClass(contents[currentIndex],hidden);
  var cur=menus[i];
  _setClass(cur,hoverClass);
  currentIndex=i;
  _setClass(contents[i],"");
  };
 })(i);
 }
 _setClass(menus[currentIndex],hoverClass);
 _setClass(contents[currentIndex],"");
 //便利函数
 function _setClass(obj,className){obj.className=className}
 function _$(oid){return typeof(oid) == "string"?document.getElementById(oid):oid}
}
</script>
<body>
<div class="wrapper">
<div id="tab">
 <!-- tabHead -->
 <ul class="tab-nav">
 <li><a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" >交易安全</a></li>
 <li><a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" >淘宝大学</a></li>
 <li><a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" >爱心</a></li>
 </ul>
 <!-- tabPanel-->
 <ul class="tab-bd">
 <li>
  1111
 </li>
 <li>
  222
 </li>
 <li>
  333
 </li>
 </ul>
</div>
<script type="text/javascript">
tabPanel({"panel":"tab"});//panel为必填项，default、defalutStyle、hoverStyle为选填项
</script>
</div>
</body>
</html>

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