Install the specified version package (the format is 'package name@version number')
npm version: npm install --save package name@version number
yarn version: yarn add package name@version number
Example: Install element-ui version 2.15.8
npm 版：npm install --save [email protected]
yarn 版： yarn add [email protected]
After installation, you can see in package.json: "element-ui": "^2.15.8"
Note: In the case of an existing version, you need to delete the dependency first, and you cannot directly change the version number in package.json, because the version number before modification is still in package-lock.json
remove dependencies
npm version: npm uninstall package-name
yarn version: yarn remove package-name
Example: delete element-ui dependency
npm 版：npm uninstall element-ui
yarn 版：yarn remove element-ui
After deletion, there is no "element-ui": "^2.15.8" in package.json
installation type
Global installation (dependencies will be downloaded and installed into the [Global Directory], and will be automatically installed when creating a new project to install dependencies)
npm version: npm install package name --global // Shorthand: npm install package name -g
yarn version: yarn global add package-name
Local installation (download dependencies to the directory project where the current command line is located)
npm version: npm install package-name
yarn version: yarn add package-name
Write information to package.json during installation
npm install xxx --save // Shorthand: npm install xxx -S or npm install xxx
npm install xxx --save-dev // Shorthand: npm install xxx -Dyarn add xxx --dev // Shorthand: yarn add xxx -D
yarn add xxx --peer // Shorthand: yarn add xxx -P
yarn add xxx --optional // Shorthand: yarn add xxx -O
// --save adds the name of the dependent package to the package.json file dependencies, the things that are still dependent after release
// --save-dev adds the name of the dependent package to the package.json file devDependencies, the things that are depended on during development// --peer adds the dependent package name to the package.json file peerDependencies
// --optional Add the dependent package name to the package.json file under optionalDependencies
Command comparison between npm and yarn
| illustrate | Yarn | NPM/CNPM |
|---|---|---|
| initialize a project | yarn init | npm init |
| Install dependencies by default | yarn install/link | npm install/link |
| Install a dependency and save it to package by default | yarn add taco | npm install taco --save |
| remove a dependency | yarn remove taco | npm uninstall taco --save |
| Install a development-time dependency | yarn add taco -dev | npm install taco --save -dev |
| Update a dependent project | yarn upgrade taco | npm update taco --save |
| Install a global dependency project | yarn global add taco | npm install taco --global |
| Publish/login/logout, a series of NPM operations | yarn publish/login/logout | npm publish/login/logout |
| run a command | yarn run/test | npm run/test |
How to quickly delete the node_modules file
Install the rimraf package globally
Function: wrap the rm -rf command in the form of a package, used to delete files and folders, no matter whether the folder is empty or not, it can be deleted
npm i rimraf -gEnter the project that needs to be cleaned up and execute the following command
rimraf node_modules