Npm安装总是返回`代码ECONNREFUSED`错误的所有pakcages

`npm ERR! code ECONNREFUSED npm ERR! errno ECONNREFUSED npm ERR! FetchError: request to http://registry.npmjs.org/body-parser failed, reason: connect ECONNREFUSED 127.0.0.1:3000` 

我尝试了proxy settings ， registry set commands ..但仍然没有用..

我使用节点js最新版本..我的应用程序监听端口是3000

我试过npm config List ..有没有错误的configuration？

  `; cli configs metrics-registry = "https://registry.npmjs.org/" scope = "" user-agent = "npm/5.3.0 node/v8.1.4 win32 ia32" ; userconfig C:\Users\JANEN\.npmrc https-proxy = "http://proxy.company.com:8080/" proxy = "http://proxy.company.com:8080/" registry = "https://registry.npmjs.org/" ; builtin config undefined prefix = "C:\\Users\\JANEN\\AppData\\Roaming\\npm" ; node bin location = C:\Program Files (x86)\nodejs\node.exe ; cwd = C:\project\authenticationIntro-master ; HOME = C:\Users\JANEN ; "npm config ls -l" to show all defaults. 

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