Why it didn't work????

Question

https://code.sololearn.com/Wag7a2wXAcZS/?ref=app
Where will be must "setInterval"?
Sorry if my English is very bad

Answer 1

I've updated your code, please have a look here:

https://code.sololearn.com/WsiJ9gbez1bc/?ref=app

Answer 2

Many thanks)