Solve the problem that the browser cache Ajax cannot obtain the latest data

When the submitted URL is consistent with the historical URL, it may obtain the data cached by the browser. Generally, the following solutions are provided:

1. Add anyajaxobj. setRequestHeader ("If-modified-since", "0") before Ajax sends a request ").

2. Add anyajaxobj. setRequestHeader ("cache-control", "No-Cache") before Ajax sends a request ").

3. Add a random number after the URL: "fresh =" + math. Random ();.

4. Add the time after the URL: "nowtime =" + new date (). gettime ();.

5. If jquery is used, you can directly set $. ajaxsetup ({cache: false }). In this way, all the Ajax operations on the page will execute this statement, so it does not need to be saved.

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