我这段代码为什么没有实现切换效果？并且鼠标滑过第二个li时，第一个li还是处于高亮状态
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>taobao demo</title>
<style type="text/css">
@font-face{font-family:iconfont;src:url(http://g.tbcdn.cn/tb/icon-font/1.1.5/iconfont.eot);
src:url(http://g.tbcdn.cn/tb/icon-font/1.1.5/iconfont.eot?#iefix) format("embedded-opentype"),url(http://g.tbcdn.cn/tb/icon-font/1.1.5/iconfont.woff) format("woff"),url(http://g.tbcdn.cn/tb/icon-font/1.1.5/iconfont.ttf) format("truetype"),
url(http://g.tbcdn.cn/tb/icon-font/1.1.5/iconfont.svg#uxiconfont) format("svg")}
body{font:12px/1.5 tahoma,arial,sans-serif;}
a{text-decoration:none;}
.search-container{position:relative;}
.search-tips{float:right; padding:3px 0 0 15px;}
.search-tips a{color:#6c6c6c;}
.search-button{float:right;}
.btn-search{
background:url(http://gtms01.alicdn.com/tps/i1/T1qyj8Fc8aXXc4E9bI-400-300.png);
width:100px;
height:45px;
background-position:0 -200px;
border:0;
cursor:pointer;
}
.search-common-panel{
height:39px;
background-color:#f50;
overflow:hidden;
padding:3px 0 3px 77px;
}
.search-common-panel input{
height:39px;
line-height:39px;
width:100%;
border:0 none;
outline:0;
background-color:#fff;
}
.search-common-panel i{
position:absolute;
top:14px;
left:86px;
z-index:2;
color:#ccc;
}
.iconfont{
font-family:iconfont;
font-size:12px;
font-style:normal;
}
ul{
list-style:none;
display:block;
}
ul,li{
margin:0;
padding:0;
}
.search-list{
position:absolute;
top:3px;
left:3px;
width:72px;
height:39px;
overflow:hidden;
background:#fff;
border-left:1px solid #f6f6f6;
border-right:1px solid #e5e5e5;
}
.search-list li{
display:none;
height:39px;
line-height:39px;
overflow:hidden;
text-align:center;
}
.search-list li a{
color:#6c6c6c;
}
.search-list .selected{
background:#f6f6f6;
display:block;
}
.trigger-hover{
height:auto;
}
.trigger-hover li{
display:block;
}
</style>
</head>
<body>
<div class="search-container">
<div id="search_tab" class="search-list">
<ul>
<li id="tab_1" class="selected"><a href="#">宝贝</a></li>
<li id="tab_2"><a href="#">店铺</a></li>
</ul>
</div>
<div class="search-pannel">
<form>
<div class="search-tips">
<a href="#">
高级<br>搜索
</a>
</div>
<div class="search-button">
<button class="btn-search" type="submit"></button>
</div>
<div class="search-common-panel">
<input type="text" x-webkit-speech="">
<i class="iconfont">ő</i>
</div>
</form>
</div>
</div>
</body>
<script>
var getDom=function(id){
return document.getElementById(id);
}
var addEvent=function(id,event,fn){
var el=getDom(id)||document;//为防止获取不存在的id而报错
if(el.addEventListener){ //针对非IE浏览器的环境
el.addEventListener(event,fn,false);//false为默认
}else if(el.attachEvent){ //针对IE浏览器的环境
el.attachEvent('on'+event,fn);
}
}
addEvent('search_tab','mouseover',function(){
this.className+=' trigger-hover';
});
addEvent('tab_1','mouseover',function(){
if(this.className.indexOf('selected')<0){
this.className+='selected';
}
});
addEvent('tab_1','mouseout',function(){
this.className+='';
})
addEvent('tab_1','click',function(){
getDom('search_tab').className='search-list';
});
addEvent('tab_2','click',function(){
getDom('search_tab').className='search-list';
});
addEvent('tab_2','mouseover',function(){
if(this.className.indexOf('selected')<0){
this.className+='selected';
}
});
addEvent('tab_2','mouseout',function(){
this.className+='';
})
</script>
</html>
