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(){ $("p").width(function(n,c){ return c-50; }); }); }); </script> </head> <body> <p style="background-color:yellow">落。</p> <button>以 50 减少 p </button> </body> </html>
查看结果: