一. npm i module_name -S
npm install is equivalent to npm i,
that is, npm install module_name --save writes dependencies,发布到生产环境。
这样安装是局部安装的, will be written into the dependency in the package.json file.dependencies：
表示生产环境下的依赖管理；（没有这些依赖，生产环境下项目将无法运行）To put it bluntly, if you install a library to build your project, such as echarts, element-ui, vue, etc. is actually working in the project, you can use -S to install.
二. npm i module_name -D
That is, npm install module_name --save-dev writes devDependencies,发布到开发环境。
这样安装是局部安装的, will be written into the devDependencies in the package.json file.devDependencies : Indicates dependency management in the development environment; (
不会影响生产环境下的项目运行)If the library you installed is used for packaging and parsing code, such as webpack, babel, vite, etc., you can use -D
to install it. After the project is launched, these libraries are useless.
三. npm i module_name -g
Indicates global installation. After one installation, it can be used directly in other places.
4. npm delete module
- 【npm uninstall/remove -S/-D xxx 】Delete the xxx module;
- [npm uninstall/remove -g xxx] delete the global module xxx;