I have this simple code.
I can’t understand why in the first two cases the output is window and in the third it is an object.

var person = {
  name: "jason",
  a: this,
  b: console.log(this),
  c: function () {
      console.log(this);
  },    
};

         
console.log(person.a);   // output Window {window: Window, self: Window, document: document, name:        'global', location: Location, …}
    
person.b;               // output Window {window: Window, self: Window, document: document, name: 'global', location: Location, …}

person.c();             //  output {name: 'jason', a: Window, b: undefined, c: ƒ}