C:\Users\anand>npm install -g @angular/cli
npm ERR! code ETIMEDOUT
npm ERR! errno ETIMEDOUT
npm ERR! network request to http://registry.npmjs.org/@angular%2fcli failed, reason: connect ETIMEDOUT 172.17.1.100:8080
npm ERR! network This is a problem 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! A complete log of this run can be found in:
npm ERR! C:\Users\anand\AppData\Roaming\npm-cache\_logs\2018-10-08T09_46_35_584Z-debug.log
我已删除npm_cache，但此后出现相同的错误。