简单教程
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代码编辑器：
<!DOCTYPE html> <meta charset="utf-8"> <link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/> <script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $("p").on("mouseover mouseout",function(){ $("p").toggleClass("intro"); }); }); </script> <style type="text/css"> .intro { font-size:150%; color:red; } </style> <p>Move the mouse pointer over this paragraph.</p> <footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
运行结果：