全部的下载源指向cnpm的指令:

npm:

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

yarn :

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

只指定node-sass的下载源：

npm:

npm config set sass-binary-site http://npm.taobao.org/mirrors/node-sass

yarn :

yarn config set sass-binary-site http://npm.taobao.org/mirrors/node-sass

然后就可以愉快得使用npm或者yarn进行下载了~