you can start by clicking commands>convert to other formats>actionscript 3/air.
your js will be commented-out because code conversion is not automated.
I read this differently than you: "I have done HTML5 canvas game by using animate cc.". To me that read like he was saying that he has done an HTML5 canvas game by using Animate CC, and the question was just about the responsive part.
To make a game responsive, open the FLA in the latest version of Animate, and in publishing settings and click on the Make Responsive box. Also click on the Scale to fill visible area box, and in the menu choose Stretch to fit.
That should get you close.