fmpq.com
源代码:
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Fmpq教程(fmpq.com)</title> <script src="https://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"> </script> <script> $(document).ready(function(){ $("button").click(function(){ $("li").toggleClass(function(n){ return "listitem_" + n; }); }); }); </script> <style> .listitem_1, .listitem_3{ color:red; } .listitem_0, .listitem_2{ color:blue; } </style> </head> <body> <h1>这是一个标题</h1> <ul> <li>Peter</li> <li>Lois</li> <li>Chris</li> <li>Stewie</li> </ul> <button>添加/移除列表项的类</button> </body> </html>
运行结果