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js实现div居中

<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"/><meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0"><title>test</title><meta name="keywords" content=""/><meta name="description" content=""/><link type="text/css" rel="stylesheet" href="http://j.laohe360.net/css/pub.css"/><script charset="utf-8" type="text/javascript" src="http://www.php100.com/statics/js//php100/js/jquery.js"></script><script>$(document).ready(function () {	//alert(document.documentElement.clientHeight);	//alert(document.documentElement.clientWidth);	var iWidth=500; //弹出窗口的宽度;	var iHeight=400; //弹出窗口的高度;	var iTop = (document.documentElement.clientHeight-iHeight)/2; //获得窗口的垂直位置;	var iLeft = (document.documentElement.clientWidth-iWidth)/2; //获得窗口的水平位置;	$("#tpsp").height(iHeight)		.width(iWidth)		.css(‘position‘,‘absolute‘)		.css("top",iTop)		.css("left",iLeft)		.css("background",‘red‘);});</script></head><body><div id="tpsp">	</div></body></html>

 

js实现div居中