Ajax get request cache processing solution

This article mainly introduces the caching processing solution for ajax get request, and analyzes the four common solutions in detail, which is of great practical value. Friends in need can refer to it

The examples in this article are described A solution to cache processing during ajax get request. Share it with everyone for your reference. The specific analysis is as follows:

Many times when the Ajax get method is called, the correct data cannot be obtained in time due to caching. Here is an analysis of the method to solve this problem:

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

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

2. After the url Add timestamp:

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 value of If-Modified-Since to 0, such as

xmlHttp.setRequestHeader('If-Modified-Since', 0);

Here you need to understand If The meaning of -Modified-Since

4. Use the header function of php

header('Cache-Control:no-cache, must-revalidate');

Set no Using cache

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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