JS clear IE Cache

Methods for automatically clearing ie cache in js-common
For dynamic files, such as index. asp? Id =... or index. aspx? I believe experienced programmers know how to prohibit the browser from caching data.
But for static files (css, jpg, gif, and so on), where do we need to disable browsers from caching them?
Method 1: In Dojo, we can do this in a simple way: in dojo. xhrGet (including post) and other methods all contain the preventCache attribute. The meaning of this attribute is: "browser cache is enabled by default, otherwise, different parameters will be automatically added to ensure that the browser cache is invalid. "You only need to assign this attribute to" true.
Method 2: document. write ("
Among them, 113 of ver = 113 is the version number, which is generally generated using CVS or other tools.
In this way, static files are cached when the cache is applied. When the version is updated, the latest version is obtained and the cache is updated.
The cache can be effectively used and updated for images.

 

Js clear browser cache 2

To reduce the network transmission pressure between the browser and the server, cache is usually performed on static files, such as js, css, and modified images, that is, add the Expires and Cache-Control parameters to the HTTP Response Headers of these files, and specify the Cache time, in this way, the browser will not send any HTTP Request (except force refresh) to the server within a certain period of time, even if the server's js, css, or image files have been updated multiple times during this period, however, the browser data is still the old data that can be cached at the beginning. Is there a way for the browser to obtain the latest data that has been modified?

Yes, the method is to use ajax to request the latest file on the server, and add the request header If-Modified-Since and Cache-Control, as follows:

$. Ajax ({
Type: "GET ",
Url: "static/cache. js ",
DataType: "text ",
BeforeSend: function (xmlHttp ){
XmlHttp. setRequestHeader ("If-Modified-Since", "0 ");
XmlHttp. setRequestHeader ("Cache-Control", "no-cache ");

}
});

Jquery is used here.

In this way, the browser will replace the latest file with the old local file.

Of course, another problem here is that js must know that the server has updated the js, css, and image, which can be solved by using cookies and time versions.

Jquery has ifModified and cache parameters SINCE 1.2. You do not need to add the header yourself.
IfModified Boolean Default: false
Allow the request to be successful only if the response has changed since the last request. This is done by checking the Last-Modified header. Default value is false, ignoring the header.
Cache Boolean Default: true
Added in jQuery 1.2, if set to false it will force the pages that you request to not be cached by the browser.
$. Ajax ({
Type: "GET ",
Url: "static/cache. js ",
DataType: "text ",
Cache: false,
IfModified: true
});