Accessing objects in js?

Question

JavaScript

For the first time I came across the fact that you need to refer from HTML to an object in js.
An object in the form of a button, the object is declared in js, but I can’t find anywhere how to access it from HTML. Those. as a matter of fact in html I describe action at clicking on object...
In general such it is possible? Or do you need a separate script?
washes who faced similar?
I can show you with a concrete example.

Answer 1

If I understood you correctly
https://jsfiddle.net/r20n9s7u/5/