继承方法-->最终模式

        function inherit(Target,Origin){
            function F(){};
            F.prototype = Origin.prototype;　　//
            Targrt.prototype = new F();
            Target.prototype.constructor = Target;　　//增加自己的constructor
            Target.prototype._super = Origin;　　//找到自己的超类
        }

function F(){};　　　　中间函数
F.prototype = Origin.prototype;　　
Targrt.prototype = new F();
或者

 

function proto(target,obj){
        function Fn(){};
        Fn.prototype = obj.prototype;
        target.prototype = new Fn();
    }
    function proto2(target,obj){
        function Fn(){};
        Fn.prototype = obj.__proto__;
        target.__proto__ = new Fn();
    }
    function son(){
        this.name = 'tom';
    };
    function father(){
        this.name = 'jim';
    };
    father.prototype = {
        lastName:'Green'
    }
    //proto(son,father);
    var s1 = new son();
    var f1 = new father();
    proto2(s1,f1);
    console.log(s1.lastName);

 

 

 

类似的方法：原型继承

function Obj(o){
        function f(){};
        f.prototype = o;
        return new f();
    }
    
    function person(name,age){
        this.name = name;
        this.age = age;
    }

    person.prototype.say = function(){
        console.log(this.name+' : '+this.age);
    }
    var p1 = Obj(new person('zhangsan',23));
    var p2 = Obj(new person('zhangsan',23));
    console.log(p1);
    console.log(p2);
    console.log(p1.__proto__ === p2.__proto__);//false
    console.log(p1.__proto__.__proto__ === p2.__proto__.__proto__);//true
    p1.name1 = 'zhangsan';
    p2.name1 = 'lisi';
    p1.__proto__.name = 'liuliu';
    console.log(p1);
    console.log(p2);
    //so要把原型的constructor回归到原型
    p1.__proto__.constructor = person;
    p1.__proto__._superProto = person.prototype;
    console.log(p1.__proto__.constructor);
    console.log(p1.__proto__._superProto);

 

闭包形式

        var inherit = (function(){
            var F = function(){}
            return function(Target,Origin){
                F.prototype = Origin.prototype;
                Target.prototype = new F();
                Target.prototype.constructor = Target;
                Target.prototype._super = Origin;
                console.log(1);
            }
        }())
        function Father(){};
        Father.prototype.name = 'zhang';
        function Son(){};
        inherit(Son,Father);
        var father = new Father();
        var son = new Son();
        console.log(son.name);

问题：
var father = new Father();
var son = new Son();//son指向一个Son()对象 ，(son.__proto__ === Son.prototype)Son.prototype指向一个空间，

inherit(Son,Father);//Son.prototype指向了另一个空间，但是son.__proto__指向的空间并没有变化，所以name属性找不到 

console.log(son.name);//undefined

实例：

        function Father(){};
        Father.prototype.lastName = 'Zhangsan';
        var F = new Father();
        function Son(){};
        Father.prototype = new Son();
        var P = new Father();
        console.log(F.lastName);//zhangsan
        console.log(P.lastName);//undefined