The problem with the function scope object

...?

...do not exactly get what above code should proof or disproof...

(function(){
var MyClassA = function(name, checkInInterval)
  {
    this.name = name;
    this.checkInInterval = checkInInterval;
    this.TimerID = null;
    this.commander = null;
  }
MyClassA.prototype.func_1 = function(commander)
  {
    /* here some code */
    this.commander = commander;
    this.TimerID = setInterval(this.func_2.bind(this), this.checkInInterval);
  }
MyClassA.prototype.func_2 = function()
  {
    var time = (typeof getTime != "undefined") ? getTime() : new Date().getTime();
    console.log(Math.floor(time)
       + ": Hi, my name is " + this.name
       + "; " + this.commander.name
       + " commanded me to check in"
       + " every " + (this.checkInInterval / 1000)
       + " seconds. --- Bye!");
  }

var MyClassB = function(name, _object)
  {
    this.name = name;
    this.Obj = _object;
  }
MyClassB.prototype.func_1 = function()
  {
    /* here some code */
    this.Obj.func_1(this);
  }

var objAlf, objAnn, objBen, objBob;

var onInit = function()
  {
    objAlf = new MyClassA("Alf",2000);
    objAnn = new MyClassA("Ann",5000);
    objBen = new MyClassB("Ben",objAlf);
    objBob = new MyClassB("Bob",objAnn);
    objBen.func_1();
    objBob.func_1();
  }
  
setTimeout(onInit, 1000);
})()

Should run in Espruino and provide output in the console like that:

1513144683321: Hi, my name is Alf; Ben commanded me to check in every 2 seconds. --- Bye!
1513144685319: Hi, my name is Alf; Ben commanded me to check in every 2 seconds. --- Bye!
1513144686318: Hi, my name is Ann; Bob commanded me to check in every 5 seconds. --- Bye!
1513144687321: Hi, my name is Alf; Ben commanded me to check in every 2 seconds. --- Bye!
1513144689322: Hi, my name is Alf; Ben commanded me to check in every 2 seconds. --- Bye!
1513144691320: Hi, my name is Alf; Ben commanded me to check in every 2 seconds. --- Bye!
1513144691321: Hi, my name is Ann; Bob commanded me to check in every 5 seconds. --- Bye!
1513144693321: Hi, my name is Alf; Ben commanded me to check in every 2 seconds. --- Bye!
1513144695319: Hi, my name is Alf; Ben commanded me to check in every 2 seconds. --- Bye!
1513144696318: Hi, my name is Ann; Bob commanded me to check in every 5 seconds. --- Bye!

...you can also just open the debugger of (chrome) browser (with 'right-click' Inspect) and paste the code into the console... :)

As the output shows, Alf - objAlf - and Ann - objAnn- know still about their names, their time interval to show up, and who commanded them: Ben and Bob.