执行npm i报错：
npm ERR! code ETIMEDOUT
npm ERR! syscall connect
npm ERR! errno ETIMEDOUT
npm ERR! network request to https://registry.npmjs.org/react-redux failed, reason: connect ETIMEDOUT 104.16.2.35:443
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
如图：
原因：这个报错是因为npm服务器的SSL证书证书过期了。
解决方法：
1.win + R打开cmd，依次执行下方的命令即可。
清除npm缓存
npm cache clean --force设置npm的严格SSL证书验证为false
npm config set strict-ssl false安装
npm install
