在不同瀏覽器
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<script type="text/javascript">
var w= document.documentElement.clientWidth
|| document.body.clientWidth;
var h= document.documentElement.clientHeight
|| document.body.clientHeight;
document.write(w,h);
</script>
</body>
</html>