在js或css后加?v= 版本号不让浏览器缓存

<span style="font-size:14px;">css和js带参数（形如.css?v=与.js?v= 或 .css?version=与.js?version= ）
<script type=”text/javascript” src=”jb51.js?version=1.2.6″></script>
<link rel=’stylesheet’ href=’base.css?version=2.3.3′ type=’text/css’ />

<script type=”text/javascript” src=”jb51.js”></script>
<link rel=’stylesheet’ href=’base.css’ type=’text/css’ />