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(){ $("button").click(function(){ alert($("li").length); }); }); </script> </head> <body> <button>Alert the number of li elements</button> <ul> <li>Coffee</li> <li>Milk</li> <li>Soda</li> </ul> </body> </html>
运行结果：