How JavaScript sets timeout for XMLHttpRequests

This article will explain in detail how JavaScript sets timeouts for XMLHttpRequests. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Sets the timeout for XMLHttpRequests.

After a XHR request takes a long time (for example, due to network problems), you may need to abort the request, so you can use setTimeout () with the XHR call.

Var xhr = new XMLHttpRequest (); xhr.onreadystatechange = function () {if (this.readyState = = 4) {clearTimeout (timeout); / / do something with response data}} var timeout = setTimeout (function () {xhr.abort (); / / call error callback}, 60,000 / * timeout after a minute * /); xhr.open ('GET', url, true); xhr.send ()

In addition, you should generally avoid synchronous Ajax requests altogether.

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