源代码 ：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>开源教程(ossoft.cn)</title> <script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $("button").click(function(){ $("ul li:first").hide(); }); }); </script> </head> <body> <p>List 1:</p> <ul> <li>Coffee</li> <li>Milk</li> <li>Tea</li> </ul> <p>List 2:</p> <ul> <li>Coffee</li> <li>Milk</li> <li>Tea</li> </ul> <button>点我</button> </body> </html>
运行结果