class Employees {
    constructor(name,age){
        this.name = name;
        this.age = age;
    }
    getInfo(){
        let {name,age} = this;
        return {name,age};
    }
    static seyHi(){
        console.log("Hi");   
    }

}

let lisi = new Employees("Aaron",18);
lisi.seyHi();   // lisi.seyHi is not a function
lisi.getInfo();  // {name: "Aaron", age: 18}
Employees.seyHi();  // Hi 這裡使用了static對seyHi方法對其進行了訪問許可權的封裝。
 

class Employees {
    constructor(name){
        this.name = name
    }
    getName(){
        console.log(this.name)
    }
    static seyHi(){
        console.log("Hi")
    }
}
class java extends Employees {
    constructor(name){
        super(name)
    }
    work(){
        console.log("我做後臺")
    }
    static seyHi(){
        console.log("Hi")
    }
}

let java = new Java("Aaron");
java.getName();
java.work();
java.seyHi();    //  java.seyHi is not a function總結：繼承可以擴充套件已存在的程式碼模組（類），他們的目的都是為了程式碼重用