Talking about Ajax to solve the problem of browser caching

The main reason that Ajax can increase the speed of page loading is to reduce the loading of duplicate data through Ajax, that is, to load the data while the data is cached in memory, once the data is loaded, as long as the page is not refreshed, the data will be cached in memory, when the submitted URL is consistent with the historical URL, Does not need to be submitted to the server, that is, no need to obtain data from the server, although the server load, improve the user experience, but not to obtain the latest data. To ensure that the information read is up-to-date, it is necessary to disable its caching function.

There are several solutions to the solution:

① add Anyajaxobj.setrequestheader ("If-modified-since", "0") before Ajax sends the request.

② add Anyajaxobj.setrequestheader ("Cache-control", "No-cache") before Ajax sends the request.

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

④ add time after the URL: "nowtime=" + new Date (). GetTime ();.

⑤ If you are using jquery, use $.ajaxsetup ({cache:false}). All Ajax on the page executes the statement without having to save the cache record.