Track variable, not scope?

Question

JavaScript

There is a player object. It has an ended property.
Is it possible to track the change of player.ended in the form of such an example

player = document.getElementsByClassName('player')[0];
scope.video = [МАССИВ];
var
          count = 0,
          length = scope.video.length;

scope.$watch("player.ended", function (newValue, oldValue) {
          if(newValue == oldValue || newValue){
            scope.player.setAttribute('src', scope.video[count++%length]);
            scope.player.play();
          }
        });

Answer 1

You don't have to do that. Find the desired event on your player and subscribe to it

Answer 2

Of course you can. Just before that, you need to set this variable before and outside the function:
newValue = "";