Nodejs (01) - introductory tutorial

install

Official website :http://nodejs.cn/download/
Installation tutorial :https://www.runoob.com/nodejs/nodejs-install-setup.html

Concept

Node.js It's based on Chrome V8 Engine Javascript Running environment

npm It is the largest software package warehouse in the world
n->nodejs
p-> package
m-> managers
npm It's with nodejs Installed package manager

upgrade npm To the highest version npm i -g npm

To configure

see npm Dependency package download Storage path npm root -g
Set up npm Dependency package download Storage path :npm config set prefix ' route '
see Bag Resource location ：npm config get registry

Solve the problem of slow download , Therefore, it is modified as a domestic site

modify Bag Resource location :npm config set registry Resource path for example :（ TaoBao npm:https://registry.npm.taobao.org）

Modify environment variables

The variable value is the dependent package storage path

The scaffold

#-g On behalf of the whole

download

grammar :npm install jquery -g( For example, download jquery)

The following appears to indicate that the download was successful

uninstall

grammar :npm uninstall jquery -g( For example, uninstall jquery)
The following appears to indicate that the uninstall was successful

Example

Create a file day1.js

console.log("Hello NodeJs");

Run... On the command line

First cd To day1.js Under the file path of
then

node day1.js

stay VsCode Run in

Download plug-ins CodeRunner

open day1.js Then click the upper right corner to execute

This is it. nodejs First program of
The end ~