BootWiki教程网
源代码：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>BootWiki 教程网</title> <script src="//cdn.staticfile.net/jquery/1.10.2/jquery.min.js"></script> <script> $(document).ready(function(){ $("button").click(function(){ alert($("li").length); }); }); </script> </head> <body> <button>输出li的数量</button> <ul> <li>Coffee</li> <li>Milk</li> <li>Soda</li> </ul> </body> </html>
运行结果