proxyconnect tcp: dial tcp :0: connectex: The requested address is not valid in its context.
出现以上问题原因不详，导致下载包的时候总提示连接失败。
解决办法
npm config delete proxy
npm config delete https-proxy
如果确实有设置代理，使用以下命令设置
npm config set proxy=http://127.0.0.1:8087
npm config set https-proxy=https://127.0.0.1:8087
