防止缓存 JavaScript 文件
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Preventing Cache on JavaScript files
提问by Ryan Fitzgerald
I'm trying to prevent 2 JavaScript files from being cached by the browser.
我试图阻止浏览器缓存 2 个 JavaScript 文件。
I've tryed to use <META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">without success. Here's my <head>element code:
我尝试使用<META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">但没有成功。这是我的<head>元素代码：
<head>
<meta charset="UTF-8">
<meta http-equiv="Cache-control" content="NO-CACHE">
<link type='text/css' href='/files/theme/popup_basic.css' rel='stylesheet' media='screen' />
<!-- JavaScript Start -->
<script type="text/javascript" src="/files/theme/gohome.js"></script>
<script type="text/javascript" src="http://192.168.0.149/redirect.js"></script>
<!-- JavaScript End -->
</head>
From my understating, this should work. But the redirect.jsfile keeps being cached!
从我的理解来看，这应该有效。但是redirect.js文件一直被缓存！
Anyone know what I'm doing wrong?
有谁知道我做错了什么？
回答by Derek
The <meta http-equiv="Cache-control" content="NO-CACHE">, the directive CACHE-CONTROL:NO-CACHE indicates cached information should not be used and instead requests should be forwarded to the origin server.
本<meta http-equiv="Cache-control" content="NO-CACHE">不应该使用NO-CACHE缓存的指示信息，而是请求应被转发到源服务器：，指令缓存控制。
In order to prevent cache on every request, you may need to add some random string in url. The example below is use javascript to dynamic create a script tag and adding random number in the url, then append it.
为了防止每次请求都缓存，您可能需要在 url 中添加一些随机字符串。下面的例子是使用javascript动态创建一个脚本标签并在url中添加随机数，然后附加它。
<script language="JavaScript">
var s=document.getElementsByTagName('script')[0];
var sc=document.createElement('script');
sc.type='text/javascript';
sc.async=true;
sc.src='http://192.168.0.149/redirect.js?v' + Math.random();
s.parentNode.insertBefore(sc,s);
</script>
If just want to prevent 1 time only, just append some string to the src.
如果只想阻止 1 次，只需在 src 中附加一些字符串。
<script src="http://192.168.0.149/redirect.js?12345678"></script>
