企业站常用的点击后弹出下拉菜单导航-JS特效-爱易网页

企业站常用的点击后弹出下拉菜单导航

日期：2014-05-18　浏览次数：20196 次

以下是程序代码

<!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>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<meta name="keywords" content="站长,网页特效,js特效,广告代码,zzjs,zzjs.net,sky,www.zzjs.net,站长特效 网" />
<meta name="description" content="www.zzjs.net,站长特效网，站长必备js特效及广告代码。大量高质量js特效，提供高质量广告代码下载,尽在站长特效网" />
<title>点击后慢慢弹出下拉菜单，sky整理收集。</title>
<script type=text/javascript>
function $(d){
 return document.getElementById(d);
}
// set or get the current display style of the div
function dsp(d,v){
 if(v==undefined){
  return d.style.display;
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  d.style.display=v;
 }
}
// set or get the height of a div.
function sh(d,v){
 // if you are getting the height then display must be block to return the absolute height
 if(v==undefined){
  if(dsp(d)!='none'&& dsp(d)!=''){
   return d.offsetHeight;
  }
  viz = d.style.visibility;
  d.style.visibility = 'hidden';
  o = dsp(d);
  dsp(d,'block');
  r = parseInt(d.offsetHeight);
  dsp(d,o);
  d.style.visibility = viz;
  return r;
 }else{
  d.style.height=v;
 }
}
/*
* Variable 'S' defines the speed of the accordian
* Variable 'T' defines the refresh rate of the accordian
*/
s=7;
t=10;
//Collapse Timer is triggered as a setInterval to reduce the height of the div exponentially.
function ct(d){
 d = $(d);
 if(sh(d)>0){
  v = Math.round(sh(d)/d.s);
  v = (v<1) ? 1 :v ;
  v = (sh(d)-v);
  sh(d,v+'px');
  d.style.opacity = (v/d.maxh);
  d.style.filter= 'alpha(opacity='+(v*100/d.maxh)+');';
 }else{
  sh(d,0);
  dsp(d,'none');
  clearInterval(d.t);
 }
}
//Expand Timer is triggered as a setInterval to increase the height of the div exponentially.
function et(d){
 d = $(d);
 if(sh(d)<d.maxh){
  v = Math.round((d.maxh-sh(d))/d.s);
  v = (v<1) ? 1 :v ;
  v = (sh(d)+v);
  sh(d,v+'px');
  d.style.opacity = (v/d.maxh);
  d.style.filter= 'alpha(opacity='+(v*100/d.maxh)+');';
 }else{
  sh(d,d.maxh);
  clearInterval(d.t);
 }
}
// Collapse Initializer
function cl(d){
 if(dsp(d)=='block'){
  clearInterval(d.t);
  d.t=setInterval('ct("'+d.id+'")',t);
 }
}
//Expand Initializer
function ex(d){
 if(dsp(d)=='none'){
  dsp(d,'block');
  d.style.height='0px';
  clearInterval(d.t);
  d.t=setInterval('et("'+d.id+'")',t);
 }
}
// Removes Classname from the given div.
function cc(n,v){
 s=n.className.split(/\s+/);
 for(p=0;p<s.length;p++){
  if(s[p]==v+n.tc){
   s.splice(p,1);
   n.className=s.join(' ');
   break;
  }
 }
}
//Accordian Initializer
function Accordian(d,s,tc){
 // get all the elements that have id as content
 l=$(d).getElementsByTagName('div');
 c=[];
 for(i=0;i<l.length;i++){
  h=l[i].id;
  if(h.substr(h.indexOf('-')+1,h.length)=='content'){c.push(h);}
 }
 sel=null;
 //then search through headers
 for(i=0;i<l.length;i++){
  h=l[i].id;
  if(h.substr(h.indexOf('-')+1,h.length)=='header'){
   d=$(h.substr(0,h.indexOf('-'))+'-content');
   d.style.display='none';
   d.style.overflow='hidden';
   d.maxh =sh(d);
   d.s=(s==undefined)? 7 : s;
   h=$(h);
   h.tc=tc;
   h.c=c;
   // set the onclick function for each header.
   h.onclick = function(){
    for(i=0;i<this.c.length;i++){
     cn=this.c[i];
     n=cn.substr(0,cn.indexOf('-'));
     if((n+'-header')==this.id){
      ex($(n+'-content'));
      n=$(n+'-header');
      cc(n,'__');
      n.className=n.className+' '+n.tc;
     }else{
      cl($(n+'-content'));
      cc($(n+'-header'),'');
     }
    }
   }
   if(h.className.match(/selected+/)!=undefined){ sel=h;}
  }
 }
 if(sel!=undefined){sel.onClick();}
}
</script>
<style type="text/css">
<!--
body{
 font-size: 12px;
 color: #999999;
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