JS Clear Browser Cache

Browser cache

1. All the data can be stored in the server, but this is not efficient, when we visit the Web page, one will be Dayton, two will waste the server storage space, three will cause pressure on the server
2. Browser caching can improve site performance and browser speed, but for Web pages that require frequent updates, caching prevents users from displaying the updated style

How to clear the cache via JS?

Random number

1. The script does not exist, but is dynamically generated by the server, so it has a version number to show the difference. The random number after the path or file name is equivalent to the file, but the browser thinks he is a version of the file!
2. The client will cache these CSS or JS files, so each time you upgrade the JS or CSS file, change the version number, the client browser will re-download the new JS or CSS files, the role of the brush cache

   /**/$ ("#pic_code"). attr (' src ', '/static/img/verify_code.png ' + '? temp= ' +  Math.random ()); /*  */<script type= "Text/javascript" src= "core.js?v=20140829" ></script>
   /* Time * *
   ? v=new Date (). GetTime ();

Meta

1. Add code to the head area in HTML:

   <meta http-equiv= "Pragma" content= "No-cache"/><meta http-equiv= "Content-type" content= "No-cache, "/><meta http-equiv=" Expires "content=" Wed, Must-revalidate 1997 08:21:57 GMT "/>

Ajax

1. Set the property Cache:false so that Ajax does not invoke the browse cache .

   Cache:false

2. Use AJAX to request the latest server files, plus the request headers if-modified-since and Cache-control, as follows:

   Beforesend:function(xmlHttp) {    xmlhttp.setrequestheader ("if-modified-since", "0");    Xmlhttp.setrequestheader ("Cache-control", "No-cache");  }

Replace

1. The principle of replace replaces the page specified by the Replace parameter with the current page

   <script language= "JavaScript" >              function Jump () {                  window.location.replace ("b.html" );              }          

JS Clear Browser Cache