请问下例，如何理解实例，构造函数，对象有点迷糊了，还有构造函数的参数问题

Question

var Car = function() {

  this.wheels = 4;

  this.engines = 1;

  this.seats = 5;

};

var myCar = new Car();

myCar.wheels = 4;

myCar.nickname = "H";

//{"wheels":4,"engines":1,"seats":5,"nickname":"H"}

var Car = function() {

  this.wheels = 4;

  this.engines = 1;

  this.seats = 5;

};

var myCar = new Car();

Car.wheels = 4;

Car.nickname = "H";

//{"wheels":4,"engines":1,"seats":5}

var Car = function(wheels,seats,engines) {

  //Change this constructor

  this.wheels = wheels;

  this.seats = seats;

  this.engines = engines;

};

var myCar = new Car(4,2,3); //可以

myCar(4,2,3);  //不可以，如果用myCar如何快速添加参数

Answer 1

Car函数在 javascript 中也是一个对象, 也是可以添加属性的, myCar 是根据构造函数创建的对象, 跟 Car 是不同的对象.