如下报错：
PS C:\Users\asus\Desktop\visual_sense_3d>npm i cnpm -g
npm ERR! code ETIMEDOUT
npm ERR! errno ETIMEDOUT
npm ERR! network request to https://registry.npmjs.org/graceful-readlink failed, reason: connect ETIMEDOUT 104.16.25.35:443
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'
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\Deshun\AppData\Roaming\npm-cache\_logs\2020-06-01T03_09_36_539Z-debug.log
解决方案：
1.查看npm镜像设置
npm config get registry
2.将npm设置为淘宝镜像
npm config set registry https://registry.npm.taobao.org
3.再次查看npm镜像设置
npm config get registry
