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Pay attention to setting timeout when using XMLHttpRequests

When XMLHttpRequests is executing, when there is no response for a long time (such as network problems, etc.), you should abort the connection, which can be done through setTimeout ():

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 ()

It is also important to note that do not initiate multiple XMLHttpRequests requests at the same time.

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