一、异常

C:\>npm install vue -g
npm ERR! code CERT_HAS_EXPIRED
npm ERR! errno CERT_HAS_EXPIRED
npm ERR! request to https://registry.npm.taobao.org/vue failed, reason: certificate has expired

二、原因

请求 https://registry.npm.taobao.org 失败，证书已过期

三、解决

1、清空缓存
        npm cache clean --force
2、查看当前的npm镜像设置
        npm config get registry
3、切换新镜像源
        npm config set registry https://registry.npmmirror.com
4、查看新源是否设置成功
        npm config get registry
5、可以正常安装需要的工具了
        npm install vue -g