51help TIY
码：
<html> <head> <script type="text/javascript" src="../jquery/jquery.js" tppabs="http://www.51help.tk/jquery/jquery.js"></script> <script type="text/javascript"> $(document).ready(function(){ $("button").click(function(){ $("<span>你好！</span>").insertBefore("p"); }); }); </script> </head> <body> <p>落。</p> <p>段落。</p> <button>在每个 p 入 span 元素</button> </body> </html>
查看结果: