What is the NPM

NPM is nodeJS package management tool

What does NPM do

You can publish your code to NPM for others to download, or you can download code shared by others on NPM.

How to use NPM

NPM is a package management tool built into NodeJS. After installing NodeJS, you can use NPM.

Commonly used instructions

Installation:

npm install xxx

NPM install XXX -g

NPM install XXX -s is stored in the devDependencies node

NPM install XXX -d store in the Dependencies node

The plug-in in devDependencies is only used in the development environment, not in the production environment, and dependencies are published to the production environment

Upload your first NPM package

1. NPM website account password

The registered address address: https://www.npmjs.com/signup

2. Initialize the project

npm init

This utility will walk you through creating a package.json file.

It only covers the most common items, and tries to guess sensible defaults.



See `npm help json` for definitive documentation on these fields

and exactly what they do.



Use `npm install <pkg>` afterwards to install a package and

save it as a dependency in the package.json file.



Press ^C at any time to quit.

package name: (npmdemo) zxb-npmdemo-wlww

Version: 1.0.0 (1.0.0)

description: test

entry point: (index.js)

test command:

git repository:

keywords:

author: zd

license: (ISC)

About to write to F:\ personal \npmDemo\package.json:



{

  "name": "npmdemo".

  "version": "1.0.0".

  "description": "test".

  "main": "index.js".

  "scripts": {

    "test": "echo \"Error: no test specified\" && exit 1"

  },

  "author": "zd".

  "license": "ISC"

}



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3. Write code

Create index. Js

export function say() {

  console.log("hello word")

}

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4. Login NPM

npm login

5. Publish the NPM package

npm publish

6. Create a project to install the published NPM package

npm install zxb-npmdemo-wlww

Introduce the newly installed package into the file

import {say} from 'zxb-npmdemo-wlww

say()

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Console output:

hello word

7. Update the NPM package

New method in index.js

export function say() {

  console.log("hello word")

}



export function sayHi() {

  console.log("hi word")

}

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Change the version number and republish NPM publish

8. Update the NPM package in the project

npm update zxb-npmdemo-wlww

9. Apply new methods to projects

import {say,sayHi} from 'zxb-npmdemo-wlww'

SayHi () console outputs Hi Word

10. Delete the NPM package on NPM

npm unpublish --force

Due to NPM security policy adjustment, this command can only delete the latest version released within 24 hours