function Person(name,age,job){
 this.name=name;
 this.age=age;
 this.job=job;
}

Person.prototype.sayName=function(){
 alert(this.name);
}

var person1 = new Person("张三","29","web frontpage manager");
var person2 = new Person("李四","22","doctor");


person1.sayName(); //弹出"张三"
console.log(person2.name)//输出“李四”

var myMammal = {
 name : 'Herb the Mammal',
 get_name : function () {
 return this.name;
 },
 says : function () {
 return this.saying || '';
 }
}

var myCat = Object.create(myMammal);
myCat.name = 'Henrietta';
myCat.saying = 'meow';
myCat.get_name = function () {
 console.log(this.says + ' ' + this.name + this.says);
}

myCat.get_name();

function () {
 return this.saying || '';
 } Henriettafunction () {
 return this.saying || '';
 }

　　if (!Object.create) {
　　　　Object.create = function (o) {
　　　　　　 function F() {}
　　　　　　F.prototype = o;
　　　　　　return new F();
　　　　};
　　}

　　var Dog= {
　　　　creatFn: function(){
　　　　　　// some code here
　　　　}
　　};

　　var Dog= {
　　　　creatFn: function(){
　　　　　　var dog= {};
　　　　　　dog.name = "狗狗";
　　　　　　dog.makeSound = function(){ alert("汪汪汪"); };
　　　　　　return dog;
　　　　}
　　};

　　var dog1 = Dog.creatFn();
　　dog1.makeSound(); // 汪汪汪

　　var Animal = {
　　　　creatFn: function(){
　　　　　　var animal = {};
　　　　　　animal.eat= function(){ alert("吃饭饭"); };
　　　　　　return animal;
　　　　}
　　};

　　var Dog= {
　　　　creatFn: function(){
　　　　　　var dog= Animal.creatFn();
　　　　　　dog.name = "狗狗";
　　　　　　dog.makeSound = function(){ alert("汪汪汪"); };
　　　　　　return dog;
　　　　}
　　};

　　var dog1= Dog.creatFn();
　　dog1.eat(); // 吃饭饭

　　var Dog= {
　　　　creatFn: function(){
　　　　　　var dog= {};
　　　　　　var sound = "汪汪汪";
　　　　　　dog.makeSound = function(){ alert(sound); };
　　　　　　return dog;
　　　　}
　　};

　　var dog1 = Dog.creatFn();
　　alert(dog1.sound); // undefined

　　var Dog= {
　　　　sound : "汪汪汪",
　　　　creatFn: function(){
　　　　　　var dog= {};
　　　　　　dog.makeSound = function(){ alert(Dog.sound); };
　　　　　　dog.changeSound = function(x){ Dog.sound = x; };
　　　　　　return dog;
　　　　}
　　};

　　var dog1 = Dog.creatFn();
　　var dog2 = Dog.creatFn();
　　dog1.makeSound(); // 汪汪汪

　　dog2.changeSound("呜呜呜");
　　dog1.makeSound(); //呜呜呜

function Parent(){
 this.name = 'mike';
} 
function Child(){
 this.age = 12;
}
Child.prototype = new Parent();//Child继承Parent，通过原型，形成链条

var test = new Child();
alert(test.age);
alert(test.name);//得到被继承的属性
//继续原型链继承
function Brother(){ //brother构造
 this.weight = 60;
}
Brother.prototype = new Child();//继续原型链继承
var brother = new Brother();
alert(brother.name);//继承了Parent和Child,弹出mike
alert(brother.age);//弹出12

function Parent(age){
 this.name = ['mike','jack','smith'];
 this.age = age;
}

function Child(age){
 Parent.call(this,age);
}
var test = new Child(21);
alert(test.age);//21
alert(test.name);//mike,jack,smith
test.name.push('bill');
alert(test.name);//mike,jack,smith,bill

function Parent(age){
 this.name = ['mike','jack','smith'];
 this.age = age;
}
Parent.prototype.run = function () {
 return this.name + ' are both' + this.age;
};
function Child(age){
 Parent.call(this,age);//对象冒充，给超类型传参
}
Child.prototype = new Parent();//原型链继承
var test = new Child(21);//写new Parent(21)也行
alert(test.run());//mike,jack,smith are both21

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

 function obj(o){
 function F(){}
 F.prototype = o;
 return new F();
 }
var box = {
 name : 'trigkit4',
 arr : ['brother','sister','baba']
};
var b1 = obj(box);
alert(b1.name);//trigkit4

b1.name = 'mike';
alert(b1.name);//mike

alert(b1.arr);//brother,sister,baba
b1.arr.push('parents');
alert(b1.arr);//brother,sister,baba,parents

var b2 = obj(box);
alert(b2.name);//trigkit4
alert(b2.arr);//brother,sister,baba,parents

function creatAnother(original){
 var clone=new Object(original);
 clone.sayHi=function(){
 alert("hi")
 };
 return clone;
}
var person={
 name:"haorooms",
 friends:["hao123","zhansan","lisi"]
}

var antherPerson=creatAnother(person);
antherPerson.sayHi();//hi

function inheritPrototype (subType,superType) {
 var prototype = Object.creat(superType.prototype);
 prototype.constructor = subType;
 subType.prototype = prototype;
};

function SuperType (name) {
 this.name = name;
 this.colors = ['red', 'blue', 'green'];
}
SuperType.prototype.sayName = function () {
 console.log(this.name);
}
function SubType(name, age) {
 //继承属性
 SuperType.call(this,name);
 this.age = age;
}
//继承方法
inheritPrototype(SubType,SuperType);
SubType.prototype.sayAge = function () {
 console.log(this.age);
}

var instance = new SubType();

//定义类
class Point {
 constructor(x, y) {
 this.x = x;
 this.y = y;
 }
 toString() {
 return '('+this.x+', '+this.y+')';
 }
}
var point = new Point(2, 3);
point.toString() // (2, 3)
point.hasOwnProperty('x') // true
point.hasOwnProperty('y') // true
point.hasOwnProperty('toString') // false
point.__proto__.hasOwnProperty('toString') // true

class ColorPoint extends Point {
 constructor(x, y, color) {
 super(x, y); // 调用父类的constructor(x, y)
 this.color = color;
 } 
 toString() {
 return this.color + ' ' + super.toString(); // 调用父类的toString()
 }
}