onscroll 实现随滚动条浮动的层

<body>
<script language="javascript">
window.onscroll=function(){
  //document.getElementById("divLeft").style.left=100+parseInt(document.body.scrollLeft) + "px";//水平浮动,竟然是上下浮动就不需要了
  document.getElementById("divLeft").style.top=100+parseInt(document.body.scrollTop) + "px";//垂直浮动

/*var divleft_float = 100+$('body').scrollTop()+'px'

$('divleft').css('top','divleft_float');jquery实现*/

}
</script>
<body>
<div ></div>
<div style="height:2000px;"></div>
</body>

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