<html><head><script src="/jquery/jquery-1.11.1.min.js"></script><script>$(document).ready(function(){ $("button").click(function(){ $("#div1").width(320).height(320); });});</script></head><body><div id="div1" style="height:100px;width:300px;padding:10px;margin:3px;border:1px solid blue;background-color:lightblue;"></div><br><button>调整 div 的尺寸</button></body></html>