A commonly used abbreviation
npm install=npm i. In git clone project, the project file and folder no node_modules, project dependent files can be large. Direct execution, npm will download and install configuration profiles based on package.json dependency.-global=-gGlobal installed, the installation package in the system default directory--save=-S, Installed inside the package will be written package.json dependencies, dependencies: production relies libraries--save-dev=-D, Installed inside the package will be written packege.json devDependencies, devdependencies: only need to rely on the development environment library