Article Introduction：Understanding the Distinction Between defer().promise and Promise in JavaScriptPromises in JavaScript provide an elegant way to handle...

2024-10-29 comment 0  939

Article Introduction：Promise can have three states: pedding, Fulfilled, and Rejected. To construct a Promise instance, you need to pass a function to the Promise constructor. The function passed in needs to have two formal parameters, both of which are function type parameters.

2019-07-10 comment 0  3763

Article Introduction：Return await Promise vs Return PromiseIn JavaScript, the difference between return await promise and return promise in asynchronous functions is...

2024-11-17 comment 0  359

Article Introduction：return await promise vs. return promise in JavaScript: Behavioral DifferencesIntroductionWhen working with asynchronous code in JavaScript,...

2024-11-18 comment 0  223

Article Introduction：Promise: English promise means that the Promise object stores the result of an event (usually an asynchronous operation) that will end in the future. Promise solution is an idea of ​​asynchronous programming, which is much more powerful than traditional callback functions and events.

2019-06-11 comment 0  22188

Article Introduction：The beginning of Promise, because of the asynchronous mechanism of JavaScript, leads to a common problem, the callback pyramid: Promise literally means promise. If A calls B, B returns a promise to A.

2020-06-29 comment 0  2297

Article Introduction：Understanding the Distinction between return await promise and return promiseIn asynchronous JavaScript, the behavior of return await promise and...

2024-11-28 comment 0  535

Article Introduction：What is Promise? Promise is a new solution for asynchronous programming. ES6 has incorporated it into the language standard, unifying its usage and natively providing the Promise object. Its introduction greatly improved the predicament of asy

2024-08-26 comment 0  327

Article Introduction：Understanding the Execution Timing of Promise Constructor CallbacksIn JavaScript, when constructing a Promise using the new Promise syntax, the...

2024-11-25 comment 0  736

Article Introduction：Promise functions include Promise constructor, then function, catch function, finally function, all function, race function, etc. Detailed introduction: 1. Promise constructor, which accepts a function as a parameter. This function has two parameters, namely resolve and reject; 2. then function, used to specify the callback function when the Promise state changes; 3. catch function, used The callback function when an error occurs in the specified Promise, etc.

2023-11-01 comment 0  1162

Article Introduction：The promise forms are: 1. Promise.resolve(value): returns a Promise object that is resolved with a given value; 2. Promise.reject(value): returns a Promise object that is rejected with a given value; 3. new Promise (executor): Creates a new Promise object and accepts an executor function as a parameter.

2023-11-01 comment 0  1790