yarn config set registry http://mirrors.cloud.tencent.com/npm/
yarn config set sass_binary_site http://mirrors.cloud.tencent.com/npm/node-sass/
yarn config set registry https://registry.npm.taobao.org --global
yarn config set disturl https://npm.taobao.org/dist --global
yarn config get registry
yarn config delete registry
yarn config list
为git设置代理
remove proxy then try again.