neat and clear code

Hello everyone!

Until now I made games with Flash + AS3, when the game commands were separate AS files with appropriate referrals from Flash (linkage).

Now, I check how I go to work with Flash CC + javaScript, I sort of figured, but one thing bothers me a lot: Is there is no way to divide the commands neatly into smaller files? Do I really have to write all my code (javaScript) one big file?

How do you advise me to fix the code so that everything will be neat and clear?

Thanks a lot!