Shulou(Shulou.com)06/01 Report--

This article mainly introduces the relevant knowledge of "how to use the Promise method". The editor shows you the operation process through the actual case. The operation method is simple, fast and practical. I hope this article "how to use the Promise method" can help you solve the problem.

Here is how to use Promise:

MyPromise.then (

Function (value) {/ * code if successful * /}

Function (error) {/ * code if some error * /}

)

Promise.then () has two parameters, one is the callback on success and the other is the callback on failure.

Both are optional, so you can add callbacks for success or failure.

Example

Function myDisplayer (some) {

Document.getElementById ("demo"). InnerHTML = some

}

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

Let x = 0

/ / generate code (this may take some time)

If (x = = 0) {

MyResolve ("OK")

} else {

MyReject ("Error")

}

})

MyPromise.then (

Function (value) {myDisplayer (value);}

Function (error) {myDisplayer (error);}

)

That's all for "how to use the Promise method". Thank you for reading. If you want to know more about the industry, you can follow the industry information channel. The editor will update different knowledge points for you every day.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.