13.原型设计

原型设计

    <script>
        //引用类型中都有prototype原型，该属性指向对象
        var obj={
            country:"中国"
        };
        function Student(name,age) {
            this.name=name;
            this.age=age;
            this.study= function () {
                console.log("我叫"+this.name+"，今年"+this.age+"岁，我爱学习。");
            };
        }
        Student.prototype=obj;
        var stu=new Student("张三","22");//内部创建了一个__proto__ 都指向了prototype
        var stu2=new Student("李四","22");//内部创建了一个__proto__ 都指向了prototype
    //    console.log(stu2.country)
        console.log(Student.prototype);//Object {country: "中国"}
        console.log(stu.__proto__);//Object {country: "中国"}

    </script>