JavaScript Pt2 - Prototypes Solution doesn't work

onesly i skip without check-it but i stop to prototype.
In prototype there is a exercize about stopwatch.

First second thirt … till 10 … times i try and it’s not works but i think with the implementation with DOT-prototype it’s will works well.

I am dyslessic and some time i think “it was my problem for dont understand in deeply the topic”, before skip i try too much times. in that context of funzions it’s for me little bit complicete to follow at 100%.

I am also a little bit background of Python and C++.

Me i write on paper first and i re-watch tutorial and write on the file and try what i do in this exercize. It’s only.
Thanks a lot at all!