ES6类与对象

1.ES5创建类

 function User(name, age) {
    this.name = name;
    this.age = age;
}
// 静态方法
User.getClassName = function () {
    return 'User';
}
User.prototype.changeName = function (name) {
    this.name = name;
}
User.prototype.changeAge = function (age) {
    this.age = age;
}
Object.defineProperty(User.prototype, 'info', {
    get() {
        return 'name:' + this.name + ' | age:' + this.age;
    }
});
/* var user = new User('lucky',30);
console.log(user.info); */
// 定义子类
function Manager(name,age,password) {
    User.call(this,name,age);
    this.password =password;    
}
// 继承静态方法
Manager.__proto__ = User;
// 继承prototype方法
Manager.prototype = User.prototype;
// 添加新方法
Manager.prototype.changePassword = function(password){
    this.password = password;
}

var m = new Manager('xxxx',30,'123');
console.log(m.name);
m.changeName('yyyy')
console.log(m.name);
console.log(m.info);

1.ES6创建类

'use strict'
class User {
    constructor(name, age) {
        this.name = name;
        this.age = age;
    }
    // 静态方法
    static getClassName() {
        return 'User';
    }
    changeName(name) {
        this.name = name;
    }
    // 定义属性info
    get info() {
        return 'name:' + this.name + ' | age:' + this.age;
    }
}
// 定义子类
class Manager extends User {
    constructor(name, age, password) {
        super(name, age);
        this.password = password;
    }
    changePassword(password) {
        this.password = password;
    }
    // 覆盖父类info
    get info() {
        let info = super.info;
        console.log(info);
        return 'new info ------';
    }
}
// let m = new Manager('baby',6,'123456');
// console.log(m.info);

// 对象没有提升
//let em = new Employee('eeee',11);//出错
class Employee extends User {
    // 默认自动加入constructor
    // constructor(...args){
    //     super(...args);
    // }

}
// let e = new Employee('zhangsan',20);
// console.log(e.info);

// 立即执行类"实例化"
// let customer = new class Customer {
//     constructor(name) {
//         this.name = name;
//     }
// }('lisi');
// console.log(customer);