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This article focuses on "what are the new features of Node.js 8.5", friends who are interested may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "what are the new features of Node.js 8.5"?

What's New in Node.js 8.5

Recently, Node.js released version 8.5, in which Node added three exciting new features.

Support for ES Module

During this iteration of the version, Node finally supported the ES module proposal of the developer's voice. This means that you can directly use the import keyword to introduce the required modules. Node 8.5 can run the following code:

`import fs from 'fs' `

Using the es module, you need to note that the extension of the incoming file should be mjs and use the-experimental-modules logo.

Restrictions on using the ES module in Node.js:

Import (), the V8 engine will be supported in the next release

Import.meta, V8 engine does not support it.

Require ('. / foo.mjs') is not supported

Performance monitoring

In Node.js version 8.5, performance is monitored by API.

In Node.js 8.5, you can call mark () and measure () API to monitor the execution time of Node.js events.

In Node.js 8.5, you can use:

Const {performance} = require ('perf_hooks') performance.mark (' A') setTimeout () = > {performance.mark ('B') performance.measure ('A to B', 'Aids,' B') const entry = performance.getEntriesByName ('A to B', 'measure') console.log (entry.duration)}, 10000)

Official document: https://nodejs.org/api/perf_hooks.html

Fs module adds file copy function

Node.js 8.5 introduces a more advanced file system, in which you can copy the code of a file directly through the fs module:

Const fs = require ('fs') fs.copyFile (' source.txt', 'destination.txt', (err) = > {if (err) {/ / handle error properly, not just console.log return console.error (err)} console.log (' source.txt was copied to destination.txt')}) so far, I believe you have a deeper understanding of "what are the new features of Node.js 8.5", 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!

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