ionic_ Network connectivity erro

错误如下：

HenHouse admin$ ionic cordova build ios --prod
> ionic integrations enable cordova
✖ Downloading integration cordova - failed!
[ERROR] Network connectivity error occurred, are you offline?

        If you are behind a firewall and need to configure proxy settings, see: 
        https://ionicframework.com/docs/cli/configuring.html#using-a-proxy
        
        Error: getaddrinfo ENOTFOUND d2ql0qc7j8u4b2.cloudfront.net 
        d2ql0qc7j8u4b2.cloudfront.net:443
            at errnoException (dns.js:50:10)
            at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:92:26)

方法：

npm config set proxy=https://registry.npm.taobao.org
npm config set https_proxy=https://registry.npm.taobao.org

参考文档
https://ionicframework.com/docs/cli/configuring.html
https://blog.csdn.net/u011127019/article/details/78855004