Is it possible to change the values ​​of the second js argument?

Question

JavaScript

Good afternoon, there is such a markup

<button onclick="cart.add('8', '1')" class="button button-cart"><span>В корзину</span></button>

cart.add('8', '1')"
// 8 - id
// 1 - количество

Question. Is it possible through JS (there is a functionality for changing the quantity) to change the second argument of the function without touching the first

Answer 1

Keep the second argument in a variable.
"Functional change quantity" change the variable.
For example :