源代码:
<!DOCTYPE html> <html> <head> <script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $("#add").click(function(){ $("p").toggleClass("main",true); }); $("#remove").click(function(){ $("p").toggleClass("main",false); }); }); </script> <style> .main { font-size:120%; color:red; } </style> </head> <body> <p>This is a paragraph.</p> <p class="main">This is another paragraph.</p> <button id="add">Add class "main"</button> <button id="remove">Remove class "main"</button> </body> </html>
运行结果：