JS实现简单悬浮框

<script type="text/javascript"> 

function scall(){ 

document.getElementById("topdiv").style.top=(document.documentElement.scrollTop)+135+"px"; 

document.getElementById("topdiv").style.left=(document.documentElement.scrollLeft+document.documentElement.clientWidth-document.getElementById("topdiv").offsetWidth)+1+"px"; 

} 

window.onscroll=scall; 

window.onresize=scall; 

window.onload=scall; 

</script>

<style type="text/css">

#topdiv { 

position: absolute; 

top:0px;

right:0px;

width: 129px; 

height: 86px; 

z-index: 10; 

text-align: center; 

background-color:white;

}

</style>

  <div id="topdiv">

  问卷调查

  参与有奖

  </div>