JavaScript 继承

1.原型链继承（会继承原型链上的全部属性和方法）

    function Grand() {}
    Grand.prototype.money = "10000";
    var grand = new Grand();

    function Father() {}
    Father.prototype = grand;
    var father = new Father();

    function Son() {}
    Son.prototype = father;
    var son = new Son;

2.构造函数继承 （B构造函数的属性完全包括A构造函数时使用）

    function A(name,age,sex) {
        this.name = name;
        this.age = age;
        this.sex = sex;
    }
    function B(name,age,sex,id) {
        Teather.call(this,name,age,sex);
//      Teather.apply(this,[name,age,sex]);
        this.id = id;
    }
    var B= new B("小明",20,"男","A0001");

3.共享原型（不能随便更改原型 A改 B也改，B改 A也改）

    A.prototype.color = "red";
    function A() {

    }
    var a = new A;
    function B() {

    }
    B.prototype = a;
    var b = new B();

4.圣杯模式 

    Father.prototype = {
        name:"wang",
    }
    function Father() {

    }
    function Son() {

    }
    var inherit = (function () {
        var A = function () {}
        return function (Target,Origin) {
            A.prototype = Origin.prototype;
            Target.prototype = new A();
            Target.prototype.constructor = Target;
            Target.prototype.uber = Origin.prototype;
       }
    })();
    inherit(Son,Father);
    var son = new Son();//必须写在 inherit()函数的调用之后 如果在之前 new 的时候 father的原型与son的原型不相等
    var father = new Father();