通过js 对引入的css添加时间戳
<script type="text/javascript">document.write("<link rel='stylesheet' type='text/css' href='./style/base.css?v=" + new Date().getTime() + "'>");document.write("<link rel='stylesheet' type='text/css' href='./style/index.css?v=" + new Date().getTime() + "'>"); </script>