《前端面试题》- JS基础-继承实现

问题

编写一个类和类继承，类名为Person，属性name,age,方法sayHello.
一个Student类，继承自Person，自有属性score,自有方法study
(请用ES5和ES6两种技术分别实现)

实现

ES6

//  编写一个类和类继承，类名为Person，属性name,age,方法sayHello.
// 一个Student类，继承自Person，自有属性score,自有方法study
// (请用ES5和ES6两种技术分别实现)

class Person {
    constructor(name, age) {
        this.name = name;
        this.age = age;
    }

    sayHello() {
        console.log('Hello');
    }
}

class Student extends Person {
    constructor(name, age, score) {
        super(name, age);
    }

    study() {
        console.log(this.name);
        console.log(this.age);
        console.log('i am studing...');
    }
}

const stu = new Student('zzh', 18, 100);
stu.sayHello();
stu.study();
//Hello
//zzh
//18
//i am studing...

ES5 (借用构造函数法)

function Person(name, age) {
    this.name = name;
    this.age = age;

    this.sayHello = function() {
        console.log('Hello');
    }
}

function Student(name, age, score) {
    Person.call(this);
    this.score = score;
    this.study = function() {
        console.log('i am studing...');
    }
}

const stu = new Student('zzh', 18, 100);
stu.sayHello();
stu.study();

//Hello
//i am studing...