当我试图安装express或任何npm数据包时，得到这种类型的错误（没有代理）（节点-v 10. 14. 2）（npm -v 6. 4. 1）

npm ERR! code ETIMEDOUT
npm ERR! errno ETIMEDOUT
npm ERR! network request to http://registry.npmjs.org/express/express failed, reason: connect ETIMEDOUT 104.16.21.35:80
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\ankit\AppData\Roaming\npm-cache\_logs\2020-10-20T15_26_19_314Z-debug.log

请帮助我，先谢谢你。