<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3c.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="html/txt; charset=utf-8" />
<title>光滑展開合攏的JS菜單效果</title>
<style>
*{margin:0;padding:0;}
ul,li{list-style:none;}
#con{width:164px; margin:50px auto 0;}
#con h4.top{ height:4px; width:164px; overflow:hidden;}
#con h4.bottom{height:4px; width:164px;overflow:hidden;}
#con div{height:0px; overflow:hidden;}
#con h3{border-top:2px solid #fff; border-bottom:1px solid #D6EFFF;}
</style>
<script language="javascript">
var speed = 30;
var oCon = null; 
var oH3List = null;
var oDivList = null;
var oUlList = null;
var oldNum = null;
var clickNum = null;
var hideTimer=null;
var showTimer=null;
window.onload=function(){
 oCon = document.getElementById("con");
 oH3List = oCon.getElementsByTagName("h3");
 oUlList = oCon.getElementsByTagName("ul");
 oDivList = oCon.getElementsByTagName("div");
 for(var i=0;i<oUlList.length;i++){
  oH3List[i].xuhao=i;
  oH3List[i].onclick=function(){
   clickNum =this.xuhao;
   changeCatalog();
  };
 }
} 
function changeCatalog(){
 var old_num_2,click_num_2;
 old_num_2 = null;
 click_num_2= null;
 if(oldNum==null){
  click_Num_2=clickNum;
  showTimer = setInterval("showUl("+click_Num_2+")",speed);
 }else if(oldNum == clickNum){
  old_num_2=oldNum;
  hideTimer = setInterval("hideUl("+old_num_2+")",speed);
 }else{
  old_num_2=oldNum;
  click_num_2=clickNum;
  hideTimer = setInterval("hideUl("+old_num_2+")",speed);
  showTimer = setInterval("showUl("+click_num_2+")",speed);
 }
}
function showUl(num){
 var move_num1 =Math.ceil((oUlList[num].offsetHeight-oDivList[num].offsetHeight)/10);
 if(move_num1>=1){
  oDivList[num].style.height = oDivList[num].offsetHeight+move_num1+"px";
 }else{
  oldNum=num;
  clearInterval(showTimer);
 }
}
function hideUl(num){
 var move_num2=Math.ceil((oDivList[num].offsetHeight)/10);
 if(move_num2>0){
  oDivList[num].style.height=oDivList[num].offsetHeight -move_num2+"px";
 }else{
  clearInterval(hideTimer);
  if(clickNum==num){
   oldNum=null;
  }
 }
}
</script>
</head> 
<body>
<div id="con">
 <h4 class="top"></h4>
 <h1></h1>
 <h3>設計素材</h3>
 <div>
  <ul>
   <li>精品圖標</li>
   <li>圖片幻燈</li>
   <li>網頁播放器</li>
  </ul>
 </div>
 <h3>模板素材</h3>
 <div>
  <ul>
   <li>企業(yè)網站</li>
   <li>兒童網站</li>
   <li>音樂網站</li>
   <li>Discuz模板</li>
  </ul>
 </div>
 <h3>腳本下載</h3>
 <div>
  <ul>
   <li>jQuery</li>
   <li>Ajax</li>
   <li>PHP</li>
  </ul>
 </div>
 <h3>網頁特效</h3>
 <div>
  <ul>
   <li>菜單</li>
   <li>表單</li>
   <li>瀏覽器</li>
  </ul>
 </div>
 <h4 class="bottom"></h4>
</div> 
</body>
</html>

希望本文所述對大家的JavaScript程序設計有所幫助。

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