7.继承方式

原型对象：Javascript的继承是基于原型的继承

1.属性继承:call

<script>
        // 定义两个类，Person  Teacher
        function Person(name,age){
            this.name = name;
            this.age = age;
        }
        function Teacher(name,age,skill){
            var self = this;
            Person.call(self,name,age);//直接调用Person继承属性，call改变Person内部this指向
            this.skill = skill;
        }
        var t  = new Teacher("zhang",18,"js");
        console.log(t)  
//输出Teacher{name:"zhang",age:18,skill:"js"}
    </script>

2.方法继承

Teacher.prototype = Person.prototype;
重置构造属性：Teacher.prototype.constructor = Teacher;

<script>
        /* Person  Teacher */
        /* 
        原型对象:Javascript的继承是基于原型的继承
        call能够实现属性的继承
         */
        function Person(name,age){
            this.name = name;
            this.age = age;
        }
        Person.prototype.sayName = function(){
            console.log(this.name)
        }
        function Teacher(name,age,skill){
            Person.call(this,name,age)
            this.skill = skill;
        }
        Teacher.prototype.sayAge = function(){
            console.log(this.age)
        }
        /* 方法的继承 */
        Teacher.prototype = Person.prototype;
        Teacher.prototype.constructor =  Teacher;//重置构造属性
        var t = new Teacher("zhang",18,"js");
        var p = new Person("lisi",13);
        console.log(t.constructor)
    </script>