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Editor to share with you the example analysis of many requests in ajax, I believe that most people do not know much about it, so share this article for your reference, I hope you will learn a lot after reading this article, let's go to know it!

When we request data with ajax, we may encounter the possibility of being triggered by multiple clicks.

(for example, the onreadystatechange event of ajax is triggered multiple times; this is because onreadystatechange is an event handle.

Its state_Change is the name of a function that is triggered when the state of the XMLHttpRequest object changes.

The state changes from 0 (uninitialized) to 4 (complete). We execute the code only when the status is 4. "

This function is triggered each time the state of the XMLHttpRequest object changes.

It will be triggered four times, from 0 to 4. ) [PS: of course the examples cited here don't exactly match the problems encountered at work] at this point, we need a way to terminate the program.

Exit and abort are both functions used to terminate a program, so let's talk about the differences between the two.

Exit will do some releasing work: releasing all static global objects, caching, shutting down all Icano channels, and then terminating the program. If a function is registered through atexit, the registered function is also called. However, if the atexit function throws an exception, it calls terminate directly.

Abort: immediately terminate the program without any cleanup work.

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