npm npm

why

JavaScript project package management tool
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Initial Project

npm init
Initialize the project and create a package.json file
npm init -y
Quickly initialize the project (all options are yes)

Directory Explanation

package.json
Project package management file
package-lock.json
Download cache address
node_modules
Installation package download location

Installation can be abbreviated as i --save-dev abbreviated as -D --save abbreviated as -S

Global installation
npm i jquery -g
Local installation
npm i jquery
One-time installation of multiple
npm i jquery vue
Install development dependencies
npm i axios --save-D
Install runtime dependencies
npm i jquery –S
Install the module to the specified version
npm i jquery @version number

Uninstall

Uninstall jquery
npm uninstall jquery
Alias ​​(shorthand) uninstall ->remove->r

Update

update jquery
npm update jquery
alias update -> up