设置淘x,宝的是：
npm config set registry https://registry.npm.taobao.org (opens new window)

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

不想用他们的，再设置回原来的就可以了：
npm config set registry https://registry.npmjs.org (opens new window)

npm config set registry https://registry.npmjs.org

试用固定版本的npm npm install -g npm@7.5.4

npm install sass-loader@10.1.1

npm install sass-loader@8.0.0 node-sass@4.14.1 --registry=https://registry.npm.taobao.org

npm install cnpm -g

npm install cnpm -g --registry=https://registry.npm.taobao.org