css： 固定不滚动层
<style type="text/css">
html,body{ overflow:hidden; margin:0px; width:100%; height:100%; }
.virtual_body{width:100%; height:100%; overflow-y:scroll; overflow-x:auto; }
.fixed_div{position:absolute; z-index:2009; top:0px; width:100%; height:30px; border:1px solid red; background:#e5e5e5;}
</style>
<div class="fixed_div">I'm still here!</div>
<div class="virtual_body">
<div style="height:1000px; width:500px; background:#ccc">contents</div>
</div>13995643552

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