Each time the cache is cleared, a new data is obtained, so the browser caching problem is in the final analysis. Entangled for a long time, finally resolved, summed up here.
We all know that Ajax can increase the speed of page loading because it reduces the load of duplicate data through Ajax, that is, the data is cached in memory while the data is loaded, and as soon as we do not refresh the page, the data is cached in memory, and when we submit URL is consistent with the historical URL, there is no need to submit to the server, that is, do not need to obtain data from the server, although this reduces the server load to improve the user experience, but we can not get the latest data. To ensure that the information we read is up to date, we need to disable his caching capabilities.
There are several solutions:
1, before the AJAX send the request plus Anyajaxobj.setrequestheader ("if-modified-since", "0").
2, in the AJAX send the request before adding Anyajaxobj.setrequestheader ("Cache-control", "No-cache").
3, after the URL plus a random number: "Fresh=" + math.random ();
4, after the URL plus time to rub: "nowtime=" + New Date (). GetTime ();.
5, if it is using jquery, directly this can be $.ajaxsetup ({cache:false}). All Ajax on this page will execute this statement without having to save the cached record.
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