NPM operation instruction

# npm

npm yes nodejs Package management tools

npm Can support ：

1、 Download the package from the server to the local

2、 Upload the local package to the server

3、 Download the software from the server to the local

#### Initialize project

Use `npm init` Command to initialize a project , This command will create a package.json file .

#### Install a package

npm install xxx --save-dev： Install one in development mode xxx My bag

npm install xxx --save：         Install one in production mode xxx My bag

among install It can be abbreviated as i  --save It can be abbreviated as -S  --save-dev It can be abbreviated as -D

Such as installation jquery：

npm i jquery -D

-S Parameters can be omitted , Installed in production mode by default

#### Recover all dependencies

npm install         perhaps     npm i

#### Uninstall a package

npm unistall xxx   uninstall xxx This package

#### Update a package

npm update xxx Update package

#### see npm Mirror source

npm config get registry

#### install nrm

nrm It is a mirror source management tool

npm i nrm -g   // Global installation

#### see nrm Image support

nrm ls

#### Toggle mirror

nrm use taobao

# yarn

yarn yes npm An advanced version of however yarn and npm Can't coexist   A project uses npm You can't use yarn

#### install yarn

1、 Go to the official website to find the installation package and install it manually

2、 adopt npm install ：

​            npm i yarn -g

#### Initialize project

yarn init

#### Installation package

yarn add xxx         Install a package

yarn add [email protected]     Specify version installation

yarn add xxx --dev     development environment

yarn add xxx --peer     Production environment

#### Upgrade package

yarn upgrade xxx Update a package

#### Remove package

yarn remove xxx remove / Uninstall a package

#### Install all dependencies

yarn install                yarn

# cnpm

cnpm It was cloned on Taobao npm, Copied a copy with the image of Taobao npm

#### install cnpm

npm i cnpm -g

Operation and of package management npm As like as two peas

For example, the installation package uses ：

cnpm i jquery -S

How to put a yarn The management project is changed to npm

1、 Delete yarn.lock

2、 Delete nodemodules Catalog

3、npm install Use npm Recovery projects