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(){ $("img").attr("width",function(n,v){ return v-50; }); }); }); </script> </head> <body> <img src="../i/eg_smile.gif" tppabs="http://www.51help.tk/i/eg_smile.gif" width="128" height="128" /> <br /> <button>宽度 50 像素</button> </body> </html>
查看结果: