<html>
<head>
</head>
<body style="height:400px">
<div id="div1">12312</div>
<script type="text/javascript">
document.getElementById("div1").style.height=document.body.style.height;
alert(document.getElementById("div1").style.height);
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document.getElementById("div1").style.height=document.body.offsetHeight
alert(document.getElementById("div1").style.height);
</script>
</body>
</html>
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