面向对象编程

原型对象

Javascript、Java、c#...面向对象，JavaScript有些区别

类：模板原型对象
对象：具体的实例

在JavaScript这个需要大家换一下思维方式！原型

let Student = {
        name:"zhangsan",
        age:22,
        run:function(){
            console.log(this.name+" run.... ");
        }
    };
    let xiaoming = {
        name:"xiaoming"
    };
    xiaoming.__proto__ = Student;

    let Bird = {
        fly:function (){
            console.log(this.name+" fly.... ");
        }
    }

    //小明的原型 是 Student
    xiaoming.__proto__ = Bird;

以前的方式

function Student(name){
        this.name = name;
    }
    //给Student新增一个方法
    Student.prototype.hello = function(){
        alert('hello');
    }

class继承

Class关键字，是在ES6引入的 1、定义一个类，属性，方法

//定义一个学生的类
    class Student{
        constructor(name) {
            this.name = name;
        }
        hello(){
            alert('hello');
        }
    }
let xiaoming = new Student("xiaoming");
let xiaohong = new Student("xiaohong");
xiaoming.hello();

2、继承

 class Student{
        constructor(name) {
            this.name = name;
        }
        hello(){
            alert('hello');
        }
    }
    class pupil extends Student{
        constructor(name,grade){
            super(name);
            this.grade = grade;
        }
        myGrade(){
            alert('我是一名小学生');
        }
    }
    let xiaoming = new Student("xiaoming");
    let xiaohong = new pupil("xiaohong",1);
    xiaoming.hello();