function SuperType(name) {
    this.name = name;
    this.colors = ["red", "blue", "green"];
  }
  SuperType.prototype.sayName = function() {
    alert(this.name);
  }
  function SubType(name, age) {
    SuperType.call(this, name);
    this.age = age;
  }

  //继承方法
  SubType.prototype = new SuperType();
  SubType.prototype.sayAge = function() {
    alert(this.age);
  }

  var instance1 = new SubType("Nicholas", 29);
  instance1.colors.push("black");
  alert(instance1.colors); //red,blue,green,black
  instance1.sayName(); //Nicholas
  instance1.sayAge(); //29

  var instance2 = new SubType("Greg", 27);
  alert(instance2.colors); //red,blue,green
  instance2.sayName(); //Greg
  instance2.sayAge(); //27

function object(o) {
    function F(){};
    F.prototype = o;
    return new F;
  }

  var person = {
   name: "Nicholas",
   friends: ["Shelby", "Court", "Van"]
  };

  var antherPerson = object(person);
  antherPerson.name = "Greg";
  antherPerson.friends.push("Rob");

  var antherPerson = object(person);
  antherPerson.name = "Linda";
  antherPerson.friends.push("Barbie");

  alert(person.friends); //Shelby,Court,Van,Rob,Barbie

function object(o) {
    function F(){};
    F.prototype = o;
    return new F;
  }
  function createAnother(original) {
    var clone = object(original);
    clone.sayHi = function() {
      alert("Hi");
    };
    return clone;
  }

  var person = {
    name: "Nicholas",
    friends: ["Shelby", "Court", "Van"]
  };

  var anotherPerson = createAnother(person);
  anotherPerson.sayHi();

//继承原型
  function extend(subType, superType) {
    function F(){};
    F.prototype = superType.prototype;

    var prototype = new F;
    prototype.constructor = subType;
    subType.prototype = prototype;
  }

  //超类方法
  function SuperType(name) {
    this.name = name;
    this.colors = ["red", "blue", "green"];
  }
  SuperType.prototype.sayName = function() {
    return this.name;
  }

  //子类方法
  function SubType(name, age) {
    SuperType.call(this, name);
    this.age = age;
  }

  //继承超类的原型
  extend(SubType, SuperType);

  //子类方法
  SubType.prototype.sayAge = function() {
    return this.age;
  }

  var instance1 = new SubType("Shelby");
  var instance2 = new SubType("Court", 28);

  instance1.colors.push('black');

  alert(instance1.colors); //red,blue,green,black
  alert(instance2.colors); //red,blue,green

  alert(instance1 instanceof SubType); //true
  alert(instance1 instanceof SuperType); //true