<html><head><script type="text/javascript" src="/jquery/jquery.js"></script><script type="text/javascript">$(document).ready(function(){ $("button").click(function(){ $("img").attr("width","180"); });});</script></head><body><img src="/i/eg_smile.gif" /><br /><button>设置图像的 width 属性</button></body></html>