About the Ajax timestamp, Ajax requests with the same parameters are only processed once at a time interval.

When I log on to Ajax, I find the same parameter request, such as username ZZZ and password ZZ. After I click "Log on:
For a browser, your first click will call the RPC request. However, when you use the same browser to submit a form, RPC will not be submitted because the parameters are the same, this may be a problem with the XMLHTTPRequest object of Ajax. It sets the time interval, which is actually (New activexobject ("Microsoft. XMLHTTP "))
Therefore, in actual operations, Pass a useless Ts = new date (). gettime () to the RPC Parameter ()
A timestamp to ensure that each click event will trigger the RPC request because their parameters (or URLs) are different.

Alibaba Cloud: Why do we need to append the timestamp to the target URL?
In some cases, Some browsers cache the results of multiple XMLHttpRequest requests in the same URL. If the response to each request is different, this will bring bad results. Append the current timestamp to the end of the URL to ensure the uniqueness of the URL, thus avoiding the browser's cache results.