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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"
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