<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk" />
<title>隨屏滾動</title>
<style>
 html,body{
  padding:0;
  margin:0;
 }
</style>
</head>
<body>
 <div id="aa" style="width:200px;height:200px;background:#c0c0c0;" >我在隨屏滾</div>
 <div id="bb" style="width:200px;height:200px;background:#c0c0c0;" >我靜止不動</div>
 <div style="width:100%;height:500px;background:#000"></div>
 <div style="width:100%;height:500px;background:green"></div>
 <div style="width:100%;height:500px;background:red"></div>
</body>
</html>
<script>
function scroll(p){
 var d = document,dd = d.documentElement,db = d.body,w = window,o = d.getElementById(p.id),ie = /msie/i.test(navigator.userAgent),style;
  if(o){
  o.style.cssText +=";position:"+(p.f&&!ie?'fixed':'absolute')+";"+(p.l==undefined?'right:0;':'left:'+p.l+'px;')+(p.t!=undefined?'top:'+p.t+'px':'bottom:0');
   if(p.f&&ie){
   o.style.cssText +=';left:expression(body.scrollLeft + '+(p.l==undefined?db.clientWidth-o.offsetWidth:p.l)+' + "px");top:expression(body.scrollTop +'+(p.t==undefined?db.clientHeight-o.offsetHeight:p.t)+'+ "px" );'
    db.style.cssText +=";background-image:url(about:blank);background-attachment:fixed;"
   }else{
    if(!p.f){
     w.onresize = w.onscroll = function(){
      var timer,timer1;
      return function(){
       if(timer)
        clearTimeout(timer);
       timer = setTimeout(function(){
        timer1 = setInterval(function(){
         var st = db.scrollTop,c;
         c = st - o.offsetTop + (p.t!=undefined?p.t:(w.innerHeight||db.clientHeight)-o.offsetHeight);
         if(c!=0){
          o.style.top = o.offsetTop + Math.ceil(Math.abs(c)/10)*(c<0?-1:1) + 'px';
         }else{
          clearInterval(timer1);  
         }
        },10)
       },100)//控制滾動的頻率越大頻率越慢
      }
     }()
    }
   }
  } 
 }
 scroll({
  id:'aa'
 })
  scroll({
  id:'bb',
  l:0,
  t:200,
  f:1
  })
</script>

希望本文所述對大家JavaScript程序設計有所幫助。

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