Just enable the console logs in the emulator. Here my example:
> ionic emulate ios --livereload
Setup Live Reload
Running dev server: http://localhost:8100
Adding in default Ionic hooks
Running live reload server: http://localhost:35729
Watching : [ 'www/**/*', '!www/lib/**/*' ]
Ionic server commands, enter:
restart or r to restart the client app from the root
goto or g and a url to have the app navigate to the given url
consolelogs or c to enable/disable console log output
serverlogs or s to enable/disable server log output
quit or q to shutdown the server and exit
Type consolelogs in the command line and hit enter.
consolelogs
Console log output: enabled
Loading: /?restart=382451
ionic $ 0 498458 log Hi there! This is from console.log