The function of async/await Writing in javascript

This article mainly explains "the role of async/await writing in javascript". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn "the role of async/await writing in javascript".

Description

1. You can see that the writing of async/await is very similar to generator.

2. Async/await is the syntax sugar of generator, but it has a built-in actuator. When an exception occurs during execution, execution is stopped.

Await must be connected after the promise,node version must be > = 7.6.0 to use, of course, the lower version can also use babel.

Example

Const fs = require ('fs'); const utils = require (' util'); const readFile = utils.promisify (fs.readFile); async function readJsonFile () {try {const file = await readFile ('.. / generator/config.json'); console.log (file.toString ());} catch (e) {console.log ('wrong');}} readJsonFile () At this point, I believe you have a deeper understanding of "the role of async/await writing in javascript". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!