My Canvas game doen't have any output please tell me what's wrong

Question

I made a mini game with canvas but it doesn't drawing a ball on window why?
please tell me whats wrong.
https://code.sololearn.com/W56C13aKCZSt/?ref=app

Answer 1

ok thanks I found it

Answer 2

There was no
ctx.fill() or....
ctx.stroke() in your code.

https://code.sololearn.com/WO521HwDJePs/?ref=app