npm命令
//安装
npm install --save-dev sass-loader
npm install --save-dev node-sass
//卸载
npm uninstall --save-dev sass-loader
npm uninstall --save-dev node-sass
yarn命令
yarn add sass-loader --dev
yarn add node-sass --dev
//一起安装
yarn add sass-loader node-sass --dev
//卸载
yarn remove sass-loader --dev
yarn remove node-sass --dev
