解决：sass-loader@6.0.6 requires a peer of node-sass@^4.0.0 but none is installed. You must install peer dependencies yourself.

参考：https://blog.csdn.net/hancoder/article/details/113821646

去https://github.com/sass/npnode-sass 或者 https://github.com/sass/node-sass/releases 都可以看到node和node-sass对应的版本信息

npm config set registry http://registry.npm.taobao.org/

npm install  node-sass@4.14