javascript 面向对象 prototype原型

//定义构造函数，规定每个js对象必须定义Create构造方法

function New(aClass,params){
 function _new(){

  if(aClass.Create)
     aClass.Create.apply(this,params);
 }
 _new.prototype = aClass;
 return new _new();
} 

function Extents(BaseClass,SubClass){
 function _extends(){
  for(var member in SubClass){
   this[member] = SubClass[member];// 把子类中方法，属性 复制到“临时类中”
  }
 }
 _extends.prototype = BaseClass;//给临时类得prototype赋值，指向基类   这样临时就有了基类的所有特性。
 return new _extends(); //返回临时对象。
}

var Person = Extents({},{
  Create:function(name,age){this.name=name;this.age=age;},
  sayHello:function(){alert("my name is "+ this.name+" and age is "+ this.age+  ". i like making friends especially girl friends");}
 });

var p = New(Person,["刘志全",23]);
p.sayHello();

var Engineer = Extents(Person,{
 Create:function(name,age,lan,salary){
           Person.Create.call(this,name,age) ;
           this.lan = lan;
           this.salary = salary;
          },
 
 introduce:function(){
   document.write("i am a  "+ this.lan + " programer  and  the salary is "+ this.salary );
  }
 
 });

var engineer = New(Engineer,["全哥",23,"java,php,javascript and android","secret"] )

engineer.sayHello();
engineer.introduce();