"Changing attributes" why use it?

Question

https://www.sololearn.com/Play/JavaScript

Why this needed??
Why not simply just change the link manually?

Answer 1

Perhaps changing the link manually is tedious and much effort? I had written the below code.
In no sane mind would i manually change the link and try to visit more than 20 images let alone a few hundred.
https://code.sololearn.com/WHIg0GppGZi6/?ref=app