方法一.
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<span onClick="with(document.getElementById('pop')){style.display='';tabIndex = 1;focus();}" style="color:#F00">打开层</span>
<div>aaaaaaaaaaaa</div>
<div>aaaaaaaaaaaa</div>
<div>aaaaaaaaaaaa</div>
<div>aaaaaaaaaaaa</div>
<div>aaaaaaaaaaaa</div>
<div>aaaaaaaaaaaa</div>
<div id="pop" hidefocus="true" onblur="this.style.display='none';" style="border:#000; background-color:#CCC; position:absolute; left:50px; top:50px;width:200px;height:200px; display:none">浮层，点击这个浮层以外的区域，都可以隐藏这个浮层，怎么做啊，多谢了</div>
</body>
</html>
方法二。
<!DOCTYPE html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<html>
<head>
<meta charset=" utf-8">
<meta name="author" content="http://www.softwhy.com/" />
<title>蚂蚁部落</title>
<script type="text/javascript" src="jquery-1.7.2.min.js"></script>
<script type="text/javascript">
$(function() {
$(".a").on("click", function(e) {
if ($(".menu").is(":hidden")) {
$(".menu").show();
} else {
$(".menu").hide();
}
$(document).one("click", function() {
$(".menu").hide();
});
e.stopPropagation();
});
$(".menu").on("click", function(e) {
e.stopPropagation();
});
})
</script>
</head>
<body>
<p>
<a href="javascript:void(0)" class="a">菜单按钮</a>
</p>
<div class="menu">
<a href="http://www.baidu.com">百度</a>
</div>
</body>
</html>