【报错】Error: https://registry.npmmirror.com.tgz: tunneling socket could not be established, cause=co..

报错信息：
Error: https://registry.npmmirror.com/bytes/download/bytes-3.0.0.tgz: tunneling socket could not be established, cause=connect ECONNREFUSED 127.0.0.1:31181
详细报错：

  Error: https://registry.npmmirror.com/bytes/download/bytes-3.0.0.tgz: tunneling socket could not be established, cause=connect ECONNREFUSED 127.0.0.1:31181
      at ClientRequest.onError (E:\nvm\v8.9.3\node_modules\yarn\lib\cli.js:152151:17)
      at Object.onceWrapper (events.js:315:30)
      at emitOne (events.js:116:13)
      at ClientRequest.emit (events.js:211:7)
      at Socket.socketErrorListener (_http_client.js:387:9)
      at emitOne (events.js:116:13)
      at Socket.emit (events.js:211:7)
      at emitErrorNT (internal/streams/destroy.js:64:8)
      at _combinedTickCallback (internal/process/next_tick.js:138:11)
      at process._tickCallback (internal/process/next_tick.js:180:9)

查看镜像
npm config get registry  //查看

yarn config get registry

// https://registry.npm.taobao.org/

切换淘宝镜像
npm config set registry https://registry.npm.taobao.org
yarn config set registry https://registry.npm.taobao.org

我一开始以为是镜像源出错，就一直在更换镜像源，结果可想而知，依旧没有解决错误，在不断查找资料发现自己的方向就错了，这个问题的核心错误信息是：

ECONNREFUSED 127.0.0.1:31181

我最近科学上网，可能改到了什么东西，所以先查询重置下。

首先可以查看一下npm的代理配置：

npm config get https-proxy
 
http://127.0.0.1:31181/
然后查看本地的端口没有对应的服务开启：
netstat -ano


1.清空相关代理，http-proxy和proxy

npm config delete https-proxy
npm config delete proxy
2.查看配置代理的结果
npm config get proxy
//返回null
npm config get https-proxy

最后，试试看。可以了。

如果还不行，就清下yarn的缓存
yarn cache clean