实现随页面滚动的层(最简单效果)
<!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" />
<title>无标题文档</title>
</head>
<body>
<div id="sorollDiv1" style="width:30px; height:50px; background-color:#0000ff; right:10px;position:absolute;top:120px;"></div>
<script type="text/javascript">
var lastScrollY=0;
function heartBeat(){
diffY=document.documentElement.scrollTop;
percent=0.1*(diffY-lastScrollY);
if(percent>0)percent=Math.ceil(percent);
else percent=Math.floor(percent);
document.getElementById("sorollDiv1").style.top=parseInt(document.getElementById("sorollDiv1").style.top)+percent+"px";
lastScrollY=lastScrollY+percent;
}
window.setInterval("heartBeat()",1);
</script>
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</body>
</html>
