Is there a JS docs page?

Hey guys,
Sorry if extremely newby question but I'm starting out scripting the JS way. I wanted to ask is there a javascript specifics doc page with a list of all the functions and specs? I tried to look at the applescript functions but they dont translate perfectly.

E.G.
Resize Canvas, which in apple script takes in as a third param "top left" in javascript i found i need to do AnchorPosition.TOPLEFT
If you could let me know how I could find a list of all of the JS functions specifically hopefully with an example line that would be amazing.

Thanks so much!