Ajax GET request-time cache handling solution _ajax related

The example in this article describes the caching processing solution for Ajax get requests. Share to everyone for your reference. The specific analysis is as follows:

Many times in the Ajax get method call, because the cache is not timely access to the correct data, here is to analyze the way to solve this problem:

1. Add a random number after the URL, such as:

Copy Code code as follows:

Http://www.test.com?a=a&b=b&r=Math.random ();

2. Add a timestamp after the URL:

Copy Code code as follows:

var t = new Date (). GetTime ();
Http://www.test.com?a=a&b=b&t=t

3. Use the setRequestHeader function of the XMLHttpRequest object to set the If-modified-since value to 0, as

Copy Code code as follows:

Xmlhttp.setrequestheader (' If-modified-since ', 0);

Here to understand the meaning of if-modified-since

4. Using the header function of PHP

Copy Code code as follows:

Header (' Cache-control:no-cache, Must-revalidate ');

Setting does not use caching

I hope this article will help you with your AJAX programming.