在meta里设置了防止浏览器缓存的代码 在地址栏回车为什么还是有缓存呢?？

想要强制让浏览器不缓存，在meta标签里写上了

<meta http-优艾设计网_Photoshop论坛equiv="Pragma" content="no-cache"> <meta http-equiv="Cache-Control" content="no-cache"> <meta http-equiv="Expires" content="0">

但是在地址栏回车的时候，chrome的f12里，css/js/img仍然是Status Code:200 OK (from cache)

Response Header：

Response Header(9) Accept-Ranges:bytes Content-Encoding:gzip Content-Length:32784 Content-Type:application/x-javascript Date:Mon, 31 Oct 2016 06:44:52 GMT ETag:"19ba10a-169d7-52f3ac60e7c40"-gzip Last-Modified:Wed, 30 Mar 2016 02:19:21 GMT Server:Apache/2.2.9 (Unix) mod_ssl/2.2.9 OpenSSL/0.9.8e-fips-rhel5 DAV/2 SVN/1.3.2 PHP/5.2.6 Vary:Accept-Encoding,User-AgentResponse Header Provisional headers are shown Referer:http://xxx.xxx.com/ User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36

直接用F5刷新的时候，js和css不缓存了，但是图片返回status 304

---