1.设置淘宝代理
yarn config set registry 'https://registry.npm.taobao.org'
2.如果网址本地可以打开，说明你本地有代理设置
所以需要按本地的代理 设置yarn访问代理（本地代理查看的话，点检浏览器 inter选项--> 连接 --> 局域网设置 ）
yarn config set proxy http://1.2.1.251
yarn config set https-proxy http://1.2.1.251
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