Meaning of prototype in javascript

Question

I wrote short code of inheritance of reader from Person:

Answer 1

In class-based words the difference between declaring a function via prototype and this would be something like this:

prototype:

the function of the instance would look like this:

somefunc = function(){super()/*call the function of the super-class*/};

this:

the function of the instance would look like this:

somefunc = function(){/* Do same stuff as in the prototype func declared */};

Now changing the function on the prototype will have no effect on the instance.