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js clear browser cache

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Release： 2018-04-04 11:41:16

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1. Meta method

        <META HTTP-EQUIV="pragma" CONTENT="no-cache"><!-- 禁止浏览器从本地计算机的缓存中访问页面内容 --> 
        <META HTTP-EQUIV="Cache-Control" CONTENT="no-cache"><!-- 用于指定请求和响应遵循的缓存机制 --> 
        <META HTTP-EQUIV="expires" CONTENT="0"><!-- 用于设定网页的到期时间，一旦网页过期，必须到服务器上重新传输； -->

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The approach followed by Baidu at first, but it is not suitable for 360

2. Dynamically introduce js + timestamp

去除静态html的缓存--动态引入js文件

动态引入js文件以及在js文件后边添加动态参数<script src="http://wechat.yiwang.com/appwxshare/js/share_test.js" type="text/javascript" ></script>

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Code

<html><meta charset="utf-8" /><body>
    <script type="text/javascript" src="jquery-1.9.1.min.js"></script>
    <script>
        window.onload=function(){

            var script=document.createElement("script");
            script.setAttribute("type", "text/javascript");            var num=Math.random();            var _url="http://wechat.yiwang.com/appwxshare/js/share_test.js?v="+num;
            script.setAttribute("src", _url);            var heads = document.getElementsByTagName("head");            if(heads.length) { 
                heads[0].appendChild(script);  
            }
        }        </script></body></html>

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