<html>
<head>
<title>随屏滚动</title>
<style type="text/css">
*{padding:0;margin:0;}
html{height:100%;}
body{height:200%;}
.box{position:absolute;width:100px;height:100px;background:#ccc}
</style>
</head>
<body>
<div class="box" id="box1" style="top:0;left:0;">AD1</div>
<div class="box" id="box2" style="top:0;right:0;">AD2</div>
</body>
<script type="text/javascript">
var id=function(o){return document.getElementById(o)}
var scroll=function (o){
var space=id(o).offsetTop;
id(o).style.top=space+'px';
void function(){
var goTo = 0;
var roll=setInterval(function(){
var height =document.documentElement.scrollTop+document.body.scrollTop+space;
var top = parseInt(id(o).style.top);
if(height!= top){
goTo = height-parseInt((height - top)*0.9);
id(o).style.top=goTo+'px';
}
//else{if(roll) clearInterval(roll);}
},50);
}()
}
scroll('box1');
scroll('box2');
</script>
</html>
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