Ajax solves the browser's caching problem

Today to do the project, almost all submissions are submitted through AJAX, I test found that the data is the same after each commit, debugging can exclude background code problems, so the problem must be out of the foreground. Each time the cache is cleared, a new data is obtained, so the browser caches the problem in the final analysis. Tangled for a long time, finally solved, summed up here.
We all know that Ajax can improve the speed of page loading the main reason is to reduce the loading of duplicate data through Ajax, that is, when loading data into memory, and once the data is loaded, as long as we do not refresh the page, the data will be cached in memory, when we commit URL is consistent with the historical URL, it does not need to be submitted to the server, that is, no need to get data from the server, although this reduces the load on the server 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 to the solution:
1. Add Anyajaxobj.setrequestheader ("If-modified-since", "0") to Ajax before sending the request.
2. Add Anyajaxobj.setrequestheader ("Cache-control", "No-cache") to Ajax before sending 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, you can $.ajaxsetup ({cache:false}) directly. All of the Ajax on the page will execute this statement without having to save the cache record.