备份下ionic升级

? The Ionic CLI has an update available (3.9.2 => 3.13.1)! Would you like to install it? Yes

yarn global add –non-interactive ionic@latest
✔ Running command - done!

[OK] Updated Ionic CLI to 3.13.1! ��

Please re-run your command.

Note: You can downgrade to your old version by running: yarn global add –non-interactive ionic@3.9.2
chenhailongdeMacBook-Pro:myApp chenhailong$