ES6的类和继承

class People {
    constructor(name, age) { //构造函数的属性
        this.name = name;
        this.age = age;
        this._sex = -1
    }
    get sex() { //顶层属性 get只读
        if (this._sex === 1) {
            return 'man';
        } else if (this._sex === 0) {
            return 'woman';
        } else {
            return 'error';
        }
    }
    set sex(val) { //顶层属性 set
        if (val === 0 || val === 1) {
            this._sex = val;
        }
    }
    showName() { //方法
        console.log(this.name);
    }
    static getCount() { //静态方法
        return 5
    }
}
let p1 = new People('kiw', 18);
console.log('p1', p1); //{age: 18, name: "kiw", _sex: 0}
console.log('p1.sex', p1.sex); //error
p1.sex = 0; 
console.log('p1.sex', p1.sex);  //woman
p1.showName(); // kiw
People.getCount();

class People {
    constructor(name, age) { //构造函数的属性
        this.name = name;
        this.age = age;
    }
    showName() { //方法
        console.log(this.name);
    }
}
class Coder extends People {
    constructor(name, age, company) {
        super(name, age);
        this.company = company;
    }
    showCompany() {
        console.log(this.company);
    }
}

let c1 = new Coder('zhangsan', 22, 'imooc');
console.log('c1', c1); //Coder {name: "zhangsan", age: 22, company: "imooc"}
c1.showName(); // zhangsan
c1.showCompany(); //imooc