cordova在增加对iOS平台的支持出现错误

Question

syswin-mac:workshop syswin$ sudo cordova platform add ios
Error: Failed to fetch platform ios
Probably this is either a connection problem, or platform spec is incorrect.
Check your connection and platform name/version/URL.
Error: Invalid protocol: htt:
在执行第一条命令时出现以下错误，无法解决，已经从新卸载了cordova安装了，仍然出现这个错误，求大神帮忙解决