function Car(sColor,iDoors,iMpg) {
  this.color = sColor;
  this.doors = iDoors;
  this.mpg = iMpg;
  this.drivers = new Array("Mike","John");
  this.test=function(){
    console.log("test");
  }
}

Car.prototype.showColor = function() {
  alert(this.color);
};

var objCar = new Car("red", 1, 2);

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