npm install 报错 npm ERR! errno ETIMEDOUT

报错信息

npm ERR! errno ETIMEDOUT
npm ERR! network request to https://registry.npmjs.org/nprogress failed, reason: connect ETIMEDOUT 104.16.22.35:443
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'

解决办法：采用cnpm镜像

npm install -g cnpm --registry=https://registry.npm.taobao.org