11JavaScript中通过prototype实现继承

<script type="text/javascript">
        function Person(name, age, gender) {
            this.userName = name;
            this.userAge = age;
            this.userGender = gender;

            this.sayHello = function () {
                alert('我叫：' + this.userName + ' 今年：' + this.userAge + '岁了。性别是：' + this.userGender);
            };
        }
        //为Person的原型中增加一个sayHi
        Person.prototype.sayHi = function () {
            alert('Person原型中的SayHi');
        };

        var p = new Person('张三', 10, '男');

        //Student函数对象（Student构造函数）
        function Student(name, age,gender) {
            this.userName = name;
            this.userAge = age;
            this.userGender = gender;
        }

        //设置Student继承自p对象。
        Student.prototype = p; 


        Student.prototype.sayByebye = function () {
            alert('bye bye!!!');
        };

        var s = new Student('李四', 20,'女');

        s.sayHello();


     


    </script>