yarn依賴管理工具的使用

Yarn是Facebook發布的一款依賴管理工具，它比npm更快、更高效。

與NPM命令對照

npm install  => yarn install
npm install --save [package] => yarn add [package]
npm install --save-dev [package] => yarn add [package] --dev
npm install --global [package] => yarn global add [package]
npm uninstall --save [package] => yarn remove [package]
npm uninstall --save-dev [package] => yarn remove [package]