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<title>窗口背景变化</title>
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*{margin:0;padding:0;}
#bg{
position:absolute;
top:0px;
left:0px;
z-index:-999;
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<body>
<div id="bg"><img src="http://www.wallcoo.com/ad/Korea_Besti_Belli/images/jihyun-
bestibelli06.jpg" alt="HIGH"></div>
<input type="text" id="msg" name="msg" size="50"/>
<script type="text/javascript">
window.onresize = window.onload = function(){
var w,h
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h = document.documentElement.clientHeight;
w = document.documentElement.clientWidth;
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h = window.innerHeight;
w = window.innerWidth;
}
document.getElementById('msg').value ='窗口大小：' + 'width:' + w + '; height:'+h;
var bgImg = document.getElementById('bg').getElementsByTagName('img')
[0];
bgImg.width = (w - 5);
bgImg.height= (h-5) ;
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