ionic cordova plugin add cordova-plugin-qrscanner執行錯誤之處理

執行

ionic cordova plugin add cordova-plugin-qrscanner

出現

Failed to install 'cordova-plugin-qrscanner': CordovaError: Failed to fetch plugin cordova-plugin-swift-support via registry.
Probably this is either a connection problem, or plugin spec is incorrect.
Check your connection and plugin name/version/URL.
Error: cmd: Command failed with exit code 4294963238 Error output:
...

後找到說明，加上參數

ionic cordova plugin add cordova-plugin-qrscanner --nofetch

Ref.https://cordova.apache.org/news/2017/05/04/cordova-7.html