安装sass-loader与less-loader

npm install --save-dev sass-loader
//sass-loader依赖于node-sass
npm install --save-dev node-sass

less-loader又依赖于less
npm install --save-dev less less-loader

来源：CSDN

作者：o小红帽o

链接：https://blog.csdn.net/sinat_38728634/article/details/96443296