话不多说，请看示例代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title></title>
<link rel="stylesheet" href="http://r01.uzaicdn.com/content/v1/styles/subject.css">
<link rel="stylesheet" href="styles/lianxi.css">
<script src="http://r01.uzaicdn.com/content/v1/scripts/core.js"></script>
<script src="scripts/lianxi.js"></script>
<!--[if lt IE 9]><script src="//r.uzaicdn.com/content/libs/html5shiv.js"></script><![endif]-->
<!--[if IE 6]><script src="//r.uzaicdn.com/content/libs/dd_belatedpng_0.0.8a-min.js" type="text/javascript"></script><script>DD_belatedPNG.fix('.png');</script><![endif]-->
<style type='text/css'>
.fn-mask{width: 100%;height: 100%;background: #000;opacity: 0.5;position: fixed;left: 0;top: 0;transition:all 0.5s ease 0s;z-index: 998;}
button{margin:0 auto;display: block;margin-top: 300px;background: pink;}
.main{width: 100px;height: 100px;background: #fff;position: fixed;left: 50%;top: 50%;z-index: 1000;text-align: center;line-height: 100px;}
.main i{color: red;font-size: 36px;position: absolute;top:-30px;right: 0;cursor: pointer;}
</style>
</head>
<body>
<div class="box">
<button>活动细则</button>
<div class="fn-mask hide"></div>
<div class="main hide">
你好，我是弹窗
<i>x</i>
</div>
</div>
</body>
<script>
$(function(){
$('button').on('click',function(){
$('.fn-mask').removeClass('hide');
$('.main').removeClass('hide');
})
$('.main i').on('click',function(){
$('.fn-mask').addClass('hide');
$('.main').addClass('hide');
})
})
</script>
</html>
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