配置 yarn 使用国内镜像进行安装的 rc 文件，将此文件放到项目根目录使用

.yarnrc

registry "https://registry.npm.taobao.org"
disturl "https://npm.taobao.org/dist"
nvm_nodejs_org_mirror "http://npm.taobao.org/mirrors/node"
NODEJS_ORG_MIRROR "http://npm.taobao.org/mirrors/node"
sass_binary_site "http://npm.taobao.org/mirrors/node-sass"
electron_mirror "http://npm.taobao.org/mirrors/electron/"
SQLITE3_BINARY_SITE "http://npm.taobao.org/mirrors/sqlite3"
profiler_binary_host_mirror "http://npm.taobao.org/mirrors/node-inspector/"
node_inspector_cdnurl "https://npm.taobao.org/mirrors/node-inspector"
selenium_cdnurl "http://npm.taobao.org/mirrors/selenium"
puppeteer_download_host "https://npm.taobao.org/mirrors"
chromedriver_cdnurl "https://npm.taobao.org/mirrors/chromedriver"
operadriver_cdnurl "https://npm.taobao.org/mirrors/operadriver"
phantomjs_cdnurl "https://npm.taobao.org/mirrors/phantomjs"
fse_binary_host_mirror "https://npm.taobao.org/mirrors/fsevents"