yarn 在安装包的时候，不停显示:
info There appears to be trouble with your network connection. Retrying...关上yarn-error.log排查
Trace: Error: certificate has expired at ....... at ....... at ....... at .......论断：
淘宝镜像证书过期
解决方案：
yarn config set registry "https://registry.npmmirror.com"