NPM安装错误-代码ENOTFOUND

我正在尝试为我的家庭作业运行'npm install'，该作业已经提供了package.json文件，但我不断收到以下错误：

Ramons-MacBook-Pro-3:project4 sacrams14$ npm install
npm WARN package.json project4@1.0.0 No repository field.
npm WARN package.json project4@1.0.0 No README data
npm ERR! Darwin 14.0.0
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "install"
npm ERR! node v4.2.6
npm ERR! npm  v2.14.12
npm ERR! code ENOTFOUND
npm ERR! errno ENOTFOUND
npm ERR! syscall getaddrinfo

npm ERR! network getaddrinfo ENOTFOUND registry.npmjs.org registry.npmjs.org:80
npm ERR! network This is most likely not a problem with npm itself
npm ERR! network and is related to network connectivity.
npm ERR! network In most cases you are behind a proxy or have bad network settings.
npm ERR! network 
npm ERR! network If you are behind a proxy, please make sure that the
npm ERR! network 'proxy' config is set properly.  See: 'npm help config'

npm ERR! Please include the following file with any support request:
npm ERR!     /Users/sacrams14/Dropbox/CS 142/project4/npm-debug.log

---

看起来你的网络连接确实有问题

请检查internet连接（因为您可以在此处书写，所以似乎正常工作；）

检查npm的当前版本和您安装的版本。可能旧版本无法与服务器联系

检查您的防火墙是否允许

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