Use of NPM

One 、 install npm

npm yes Node.js The default package management system
Installation completed node after , It will be installed by default npm
npm It's also based on Node.js Developed software
download     Node:http://nodejs.cn

1.npm Setting and viewing of image

When setting up the environment, you should pass through such as ” The next code will npm Set to Taobao image
npm config set registry https://registry.npm.taobao.org --global
npm config set disturl https://npm.taobao.org/dist --global

Set current address ( Set as default address )
npm config set registry https://reistr.npmjs.org/
View the configuration results of the image
npm config get registry
Use nrm Tool switch Taobao source
npx nrm use taobao
If you need to switch back to the official source later, you can use
npx nrm use npm

You can use Taobao customized cnpm(gzip Compression support ) The command line tool replaces the default npm:
npm config get disturl
s npm install -g cnpm -rgistrttstp/istry.pm.taobao.org

2.NPM Use

npm -V By looking at the version , see npm Is the installation successful
npm install <Module Name>
Use npm Command install module
npm install <Module Name> -g You can use global directly on the command line
npm list -g View all globally installed modules
npm list vue View the version number of a module
npm -g install [email protected] (@ Followed by the version number ) So we can update npm edition
npm install -save moduleName
# -save stay package Of documents dependencies Node write dependency .
npm install -save-dev moduleName # -save-dev stay package Of documents devDependencies Node write dependency
dependencies: Run time dependencies , After the release of , That is, the modules that need to be used in the production environment

devDependencies: Development dependencies . The modules inside are used for development , You can't use it when publishing, such as in the project gulp, Compress Css Module . These modules are not needed after our project is deployed

3.Package.json Attribute specification

 
name - Package name .
version - Version number of the package .
description - Package description .
homepage - Bao's official website url.

author - The name of the author of the bag .
contributors - Name of other contributors to the package .
dependencies - Dependency package list . If the dependency package is not installed , npm Will automatically install the dependency package in node_ module Under the table of contents .
repository - The type of place where the package code is stored , It can be git or svn, git Can be found in Github On .

main - main Field specifies the main entry file of the program ,require(' moduleName') It will load the file . The default value of this field is... Under the module root directory index.js.
keywords - keyword

4.yarn Installation and use

4,1Yarn What is it? ?

"Yarn By Facebook、Google、 Exponent and Tilde Joint launch of a new JS Package management tools , As the official document says ,Yarn To make up for npm Some of the defects of . because NPM5 The following questions will appear :
npm install It's very slow . In particular, it will take half a day for new projects to be pulled down , Delete node_ modules, again install It's still the case . The same project , When multiple people develop , Due to inconsistent installed versions bug
  Official website :www.yarnpkg.com

4.2yarn Installation
download node.js, Use npm install
npm install -g yarn
View version : yarn --version
install node.js, download yarn Installation procedure :
Provide a .msi file , At run time, you will be guided to Windows. Installation on Yarn
Yarn Taobao source installation , Copy and paste the following lines to the black window to run
yarn config set registry https://registry.npm.taobao.org -g
yarn config set sass_binary_ site http://cdn.npm.taobao.org/dist/node-sass -g
 

4yarn Basic use of

yarn init
// The initialization project is the same as npm init, After executing the input information , Will generate package.json file
yarn install
// install package.json All the bags in the bag , And save the package and all its dependencies into yarn.lock
yarn install -lat
// install - A single package - - edition

yarn install --force
// Force all packages to be downloaded again
yarn install --production
// Install only dependencies Bag in
yarn install --no-lockfile
// Do not read or generate arn.lock

yarn install --pure-lockfile
// No generation yarn.lock
yarn add [package]
// Add a dependency package to the current project , Will automatically update to package.json and yarn.lock In file
yarn add [package]@[version] // Install the specified version , This refers to the main version , If you need to be accurate to a small version , Use -E Parameters
yarn add [package]@[tag] // Install a tag ( such as beta,next perhaps latest)
yarn add --dev/-D
// Add to devDependencies
yarn add -.-.......... /. Add to peerDependencies
yarn add --optional/-O
// Add to optionalDependencies

Yarn The advantages of

• Fast
• The installation version is unified
• More concise output
• Multi registration source processing .
• Better semantics