npm安装ionic出现异常：request to https://registry.npm.taobao.org/@ionic%2fcli failed, reason: certificate has expired

异常：

 异常是淘宝镜像过期了，现在淘宝镜像从https://registry.npm.taobao.org/换成了 https://registry.npmmirror.com

查看npm的配置，查看淘宝镜像地址

npm config list

 更换镜像地址

npm config set registry https://registry.npmmirror.com

再次运行ionic的安装命令成功

npm install -g @ionic/cli