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