toggleClass()使用方法

 1 <html>
 2 <head>
 3 <script type="text/javascript" src="/jquery/jquery.js"></script>
 4 <script type="text/javascript">
 5 $(document).ready(function(){
 6   $("button").click(function(){
 7     $("p").toggleClass("main");
 8   });
 9 });
10 </script>
11 <style type="text/css">
12 .main
13 {
14 font-size:120%;
15 color:red;
16 }
17 </style>
18 </head>
19 
20 <body>
21 <h1 id="h1">This is a heading</h1>
22 <p>This is a paragraph.</p>
23 <p>This is another paragraph.</p>
24 <button class="btn1">切换段落的 "main" 类</button>
25 </body>
26 </html>
if you don't try,you will never know!