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This article mainly explains "how to use the Promise object of JavaScript". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to use the Promise object of JavaScript".

The JavaScript Promise object contains production code and calls to consumer code:

Promise is a JavaScript object that links generated code to consumer code

Promise syntax

Let myPromise = new Promise (function (myResolve, myReject) {

/ / "Producing Code" (may take some time)

MyResolve (); / / when successful

MyReject (); / / when an error occurs

})

/ / "Consuming Code" (must wait for a promise to be fulfilled)

MyPromise.then (

Function (value) {/ * Code for success * /}

Function (error) {/ * Code in case of error * /}

)

When the executing code gets the result, it should call one of two callbacks:

Result call

Successful myResolve (result value)

Error myReject (error object)

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