仿QQ折叠菜单动感效果（JS+css）

答案：<!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>
<title>仿QQ下拉折叠菜单（带弹性）</title>
<style type="text/css">
body{
margin:10px;
padding:10px;
}
body,td,div,span,li{
font-size:9pt;
}
.title01,.title02{
color:#fff;
font-weight:bold;
}
#DoorP{
border:12px solid #eee;
width:150px;
height:300px;
padding:4px;
background:#fff;
}
.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:8px;
line-height:18px;
}
</style>
</head>
<body>
<div id="DoorP">
<table>
  <tr>
   <td>源码分类</td>
  </tr>
</table>
<div class="content">欢迎您！</div>
<table>
  <tr>
   <td>网页特效</td>
  </tr>
</table>
<div class="content">
  编程乐园
</div>
<table>
  <tr><td>代码下载</td>
  </tr>
</table>
<div class="content">
  QQ菜单
</div>
</div>
<script type="text/javascript">
var open = 2;// 设置初始打开的层序号
var openState = new Array();
var closeState = new Array();
var dH = 220;
function $(id){
  if(document.getElementById(id))
  {
   return document.getElementById(id);
  }
  else
  {
   alert("没有找到!");
  }
}
function $tag(id,tagName){
  return $(id).getElementsByTagName(tagName)
}
function closeMe(Cid,Oid){    
  var h = parseInt(Ds[Cid].style.height);
  //alert(h);
  if(h > 0)
  {
   h = h - Math.ceil(h/3);    
   Ds[Cid].style.height = h+"px";
  }
  else
  {    
   openMe(Oid);
   clearTimeout(closeState[Cid]);
   return false;
  }
  closeState[Cid] = setTimeout("closeMe("+Cid+","+Oid+")");
}
function openMe(Oid){
  var h = parseInt(Ds[Oid].style.height);  
  
  if(h < dH)
  {
   h = h + Math.ceil((dH-h)/3);    
   Ds[Oid].style.height = h+"px";
  }
  else
  {  
   clearTimeout(openState[Oid]);   
   return false;
  }
  openState[Oid] = setTimeout("openMe("+Oid+")");
}
var Ds = $tag("DoorP","div");
var Ts = $tag("DoorP","table");
if(Ds.length != Ts.length)
{
  alert("标题和内容数目不相同!");
}
for(var i = 0 ; i < Ds.length ; i++)
{  
  if(i==open)
  {
   Ds[i].style.height = dH+"px";
   Ts[i].className="title01";
  }
  else
  {
   Ds[i].style.height = "0px";
   Ts[i].className="title02";
  }
  Ts[i].value = i;
  Ts[i].onclick = function(){
   if(open==this.value)
   {
    return false;
   }
   Ts[open].className="title02";
   Ts[this.value].className="title01";
   for(var i = 0 ; i < openState.length ; i++)
   {
    clearTimeout(openState[i]);
    clearTimeout(closeState[i]);
   }
   closeMe(open,this.value);
   //openMe(this.value);
   open = this.value;
  }
} 
//无动画打开层函数
function showDiv(id){  
  Ds[id].style.height=dH+"px";
  Ds[open].style.height="0px";
  open = id;
}
//动画打开层函数
</script>
</body>
</html>
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