<body>
<script type="text/javascript">
var w=document.documentElement.offsetWidth ||document.body.offsetWidth;
var h=document.documentElement.offsetHeight ||document.body.offsetHeight;
document.write("w:"+w+"<br/>"+"h:"+h);
</script>
<div>aldfkdgjdgj</div>
</body>
<script type="text/javascript">
var w=document.documentElement.offsetWidth ||document.body.offsetWidth;
var h=document.documentElement.offsetHeight ||document.body.offsetHeight;
document.write("w:"+w+"<br/>"+"h:"+h);
</script>
==========这里边的两个高度是不一样的
