js 本没有继承,只用js语法来实现继承效果     function Person(age, name)        {            this.name =name;            this.age = age;        }        Person.prototype.sayHi = function () {            alert("age="+this.age+",name"+this.name);        }        var p1 = new Person(12, "ff");        var p2 = new Person(21, "fffs");        alert(p1.sayHi == p2.sayHi);        function Father(name, age)        {            this.name = name;            this.age = age;        }        Father.prototype.sayHi = function () {            alert(this.name+","+this.age);        }        function Son(name,age,gender)        {            this.gender = gender;            //call调用自己本身            Father.call(this, name, age);//"继承" "父类"的成员        }        // Son.prototype = Father.prototype; //可以用父类的方法(这里有指针的问题)        Son.prototype = new Father(); //得到父类对象        Son.prototyp.fungame = function () { }; //prototype也是一个对象        var f1 = new Father("JamesZou", 29);        f1.sayHi();        var s1 = new Son("jameszou", 1, true);