仿QQ折叠菜单平滑型（JS+css）
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<style type="text/css">
body{margin:10px;padding:10px;}
body,h2,div,span,li{font-size:12px;}
.title01,.title02 {color:#fff;font-weight:bold;}
#DoorP{border:12px solid #eee;width:150px;padding:4px;background:#fff;}
h2{text-align:center;margin:0px;padding:0px;line-height:22px;}
.title01{width:100%;height:25px;background:#00ccff;cursor:pointer;}
.title02{width:100%;height:25px;background:#99cc00;cursor:pointer;}
.content{background:#eee;border-bottom:2px solid #fff;overflow:hidden;color:#666;padding-left:4px;padding-right:4px;line-height:18px;}
.content a:link,.content a:visited{color:#666666;text-decoration:none;}
.content a:hover{color:#FF6600;text-decoration:underline;}
</style>
<title>仿QQ滑动菜单 - www.codefans.net </title>
</head>
<body>
<div id="DoorP">
<h2>源码爱好者</h2>
<div class="content">CodeFans.net<br />导航菜单<br /></div>
<h2>第二层信息</h2>
<div class="content"><a href="/">网页特效</a><br /><a href="/">源码爱好者</a><br /></div>
<h2>第三层信息</h2>
<div class="content">菜单示例<br />菜单示例<br /></div>
<h2>第四层信息</h2>
<div class="content">这是第五层<br /></div>
<h2>第五层信息</h2>
<div class="content">源码爱好者<br /></div>
<h2>第六层信息</h2>
<div class="content">最新更新<br />下载排行</div>
</div>
<script type="text/javascript">
var onum=0;
var closeState=new Array();
var ch=200;
function $(id){if(document.getElementById(id)){return document.getElementById(id);}else{alert("没有找到!")}}
function $tag(id,tagName){return $(id).getElementsByTagName(tagName)}
var Ds=$tag("DoorP","div");
var Ts=$tag("DoorP","h2");
if(Ds.length != Ts.length){alert("初始化失败!");}
function showMe(Cid,Oid){var h=parseInt(Ds[Cid].style.height);var h2=parseInt(Ds[Oid].style.height);var dH=ch;if(h>0){h=h-Math.ceil(h/3);Ds[Cid].style.height=h+"px";};if(h2<dH){h2=h2+Math.ceil((dH-h2)/3);Ds[Oid].style.height=h2+"px";};if(h<=0&&h2>=dH){clearTimeout(closeState[Cid]);return false;};closeState[Cid] = setTimeout("showMe("+Cid+","+Oid+")");}
for(var i=0;i<Ds.length;i++){
if(i==onum){Ds[i].style.height=ch+"px";Ts[i].className="title01";}else{Ds[i].style.height="0px";Ts[i].className="title02";}
Ts[i].value=i;
Ts[i].onclick=function(){if(onum==this.value){return false;};
Ts[onum].className="title02";
Ts[this.value].className="title01";
for(var i=0;i<closeState.length;i++){clearTimeout(closeState[i]);}
showMe(onum,this.value);
onum=this.value;
}
}
</script>
</body>
</html>
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