Javascript this keyword inside functions

This question already has an answer here:

How does the “this” keyword work? 19 answers

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Because value of this is determined by how function is called.. closure is called with no reference of context and global context is window (in Browser)

Use Function.prototype.call to specify this context while function is invoked

var car = {
  brand: "Nissan",
  getBrand: function() {
    var closure = function() {
      console.log(this.brand);
      console.log(this);
    };
    return closure.call(this);
  }
};

car.getBrand();

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