Wechat built-in browser prohibits caching

Solution 1：
Add the following header information in the debugging phase or frequently updated pages ：

<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="0" />

Solution 2：
When updating the file , In reference to css,js Add a version number to the statement of the file , It can effectively prevent the browser from using the cache all the time css,js

<link href="css/demo.css?v=201606131149" rel="stylesheet">

Solution 3：
Methods to prevent pages from being cached , stay URL Add random parameters later , In this way, different connections are accessed each time

window.location='xxx.html?_r='+Math.random();

Ultimate solution ：
Page dynamic introduction js file ：

  // prevent js File cache . 
    var now = new Date();
    var number = now.getYear().toString() + now.getMonth().toString() + now.getDate().toString() + now.getHours().toString() + now.getMinutes().toString() + now.getSeconds().toString();
    document.write('<scr' + 'ipt  type="text/javascript" src="internal-scripts/js/BUdas-public.js?v='+number+'"></scr' + 'ipt>');
    document.write('<scr' + 'ipt  type="text/javascript" src="internal-scripts/js/BUdas-request.js?v='+number+'"></scr' + 'ipt>');
    document.write('<scr' + 'ipt  type="text/javascript" src="internal-scripts/js/BUdas-chart.js?v='+number+'"></scr' + 'ipt>');
    document.write('<scr' + 'ipt  type="text/javascript" src="internal-scripts/js/BUdas-report.js?v='+number+'"></scr' + 'ipt>');

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