话不多说，请看示例代码：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title></title> <link href="https://r01.uzaicdn.com/content/v1/styles/subject.css"> <link href="https://www.jb51.net/styles/lianxi.css"> <script src="https://r01.uzaicdn.com/content/v1/scripts/core.js"></script> <script src="https://www.jb51.net/scripts/lianxi.js"></script> <!--[if lt IE 9]><script src="https://r.uzaicdn.com/content/libs/html5shiv.js"></script><![endif]--> <!--[if IE 6]><script src="https://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> <button>活动细则</button> <div></div> <div> 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>