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Uncaught (In Promise) error when rejecting a Promise using setTimeout() in JavaScript

I'm learning Promises in JavaScript and I decided to implement a simple Promise where I would set a timeout of 3 seconds and then reject the Promise. After rejecting it, I catch the error and display it in an HTML element. The promise runs perfectly and displays the message, but I get the following ...

P粉139351297 2023-09-05 17:39:46

Difference between ES6 and Promise/A+ specifications

The main difference is that the then method is easier to read. However, the es6 specification has never understood the then aspect. It seems that the return value of the callback function is not classified. This is just one of the doubts. Is there any pioneer who can explain the comprehensive differ...

为情所困 2017-05-19 10:36:39

javascript - promise scheduling issues

{Code...} node is inconsistent with the browser operation. It is normal to understand that p1 resolves a promise internally and is not synchronous, so it is obviously later than p2.

阿神 2017-07-05 10:54:30

javascript - promise application issue

{Code...} What I want to know is how to use this method? I entered the URL and then obtained the object image in then? But I tested it and there was no response!

阿神 2017-05-16 13:29:18

c++ - What is the relationship between browser, v8 engine, JavaScript, and ECMAScript?

This problem has troubled me for a long time, and I have read a lot of relevant information, but I still can't figure out the relationship between them. JavaScript consists of three parts: ECMAScript, dom, and bom. The browser is an environment for running scripts. Question 1: Saying that JavaScript...

淡淡烟草味 2017-06-20 10:06:31

node.js promise not working - Stack Overflow

(www.sf.gg) is China's leading developer technology community. We hope to provide a pure, high-quality technical exchange platform for programming enthusiasts, learn, communicate and grow with developers, and create an era for developers!

世界只因有你 2017-05-16 13:23:10

javascript - Questions about using promise

{Code...} The first parameter method of then should be that promise is executed when resolved, but console.log(b) is actually executed. Why is this?

高洛峰 2017-05-19 10:17:46

javascript - How does promise work?

{Code...} What does the task queue look like? I don’t need the results, I just want to know the running mechanism

黄舟 2017-05-19 10:30:35