대상, 원형, 계승

대상

대상을 생각하면 먼저 다음과 같이 만듭니다.

var p1 = {
 name: 'xyx',
 age: 22,
 sayname: function(){
   console.log(this.name);
 }
};
p.sayname();//xyx

可是如果要创建很多个，则要重复以上代码很多次，现创建一个函数，通过调用函数来创建对象：

공장 모델

function people(name,age){
 var p = {
  name: name,
  age: age,
  sayname: function(){
   console.log(this.name);
  }
 };
 return p;//    ，    
}
var p1 = people("aa",11);
 p1.sayname();//aa
var p2 = people("bb",11);
 p2.sayname();//bb

구조 함수 모드

function people(name,age){
 this.name = name,
 this.age = age,
 this.sayname = function(){
  console.log(this.name);
  }
 };
var p1 = new people("aa",11);
 p1.sayname();//aa
console.log( p1 instanceof people ); //true

//    Cake  
function Cake(color,meterial){
  this.color = color;
  this.meterial = meterial;
}
// Cake      
  Cake.prototype = { 
      other: '  ', 
      sayname: function(){ 
       console.log("  "+this.color+this.meterial);
      }
  }
var c1 = new Cake("  ","  ");
c1.sayname();//      

c1과 cake에는 다음과 같은 관계가 있습니다.

Cake.prototype===c1.__proto__;//Cake {}
Cake.__proto__;//function (){}
Cake.constructor;//Function() { [native code] }
Cake.prototype.__proto__ === c1.__proto__.__proto__;//Object {}
c1.prototype;//undefinded     prototype  
c1.constructor === Cake.prototype.constructor;//function cake(){}

다음과 같은 예가 있습니다.

//  cake    sayname，      prototype  sayname  
function Cake(color,meterial){
 this.color = color;
 this.meterial = meterial;
 this.sayname= function(){
  console.log(this.color+this.meterial);
 }
}
Cake.prototype.sayname = function(){
 console.log("  "+this.color);
}
var c1 = new Cake("  ","  ");//new  c1   ，cake   this  c1
 c1.sayname();//    

물려받다

原型链对象继承：

function People(name,age,sex){
 this.name = name;
 this.age = age;
 this.sex = sex;
}
People.prototype.say = function(){
 console.log(this.name + "   ");
}
Student.prototype = new People();//  people        
Student.prototype.constructor = Student;
function Student(name,age,sex,grade){
 People.call(this,name,age,sex);
 this.grade = grade;
}
var s1 = new Student("  ",11," ",88);

数据继承（用于默认参数）

var p1 = {name: '  ', age: 1},
    p2 = {name: '  ', sex: 'male'};
var newObj1 = $.extend(obj1, obj2); //  obj2     obj1,obj1    
var newObj2 = $.extend({}, obj1, obj2); //    obj1