Specific usage of the getStatus method?

[skyerGalaxy]

Thank you for developing this library make me easy to control dfplayer.

I'm new to arduino.I want to use getStatus method to Conditional Judgment,just like below(I'm using 1.0.7 vision)

I checked the information, but I don't have the specific usage of 'getStatus` method, can you help me? Thank you!