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源代码：
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<!DOCTYPE html> <html> <head> <script src="//libs.baidu.com/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $("button").click(function(){ $("p").toggleClass("main"); }); }); </script> <style> .main { font-size:120%; color:red; } </style> </head> <body> <button>Toggle class "main" for p elements</button> <p>This is a paragraph.</p> <p>This is another paragraph.</p> <p><b>Note:</b> Click the button more than once to see the toggle effect.</p> </body> </html>
运行结果
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