<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>居中</title>
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
</head>
<style>
.center {
background-color: #FFFF00;
height: 200px;
300px;
}
</style>
<body>
<div id="box">
<div class="center"></div>
</div>
</body>
<script>
$(function(json){
function Fjuzhong(){
var win ={},middle={};//win为浏览器的长宽对象，middle为要居中的元素的长宽对象
var objDom =$(json.obj);
win.width = $(window).width();
win.height = $(window).height();
middle.width = objDom.width();
middle.height = objDom.height();
var left=(win.width-middle.width)/2+"px";
var top=(win.height-middle.height)/2+"px";
objDom.css({"margin-top":top,"margin-left":left});
$(window).resize(Fjuzhong);//当浏览器长宽发生变化时，元素会相应居中
}
var json = {"obj":".center"};
Fjuzhong(json);
});
</script>
</html>
