Node.JS实战66：ES6新特性：类语法

ES6是可以使用类的。直接上例程：

class Person{

constructor (name, surname, age){

this.name = name;

this.surname = surname;

this.age = age;

}

getFullname (){

return this.name + " " + this.surname;

}

static older(Person1, Person2){

return (Person1.age >= Person2.age) ? Person1: Person2;

}

}

var aPerson = new Person("Wang","Liwen",18);

console.log(aPerson.getFullname());

执行效果：

类的语法更具可读性、简单易懂。

而类的杀手锏在于：可使用extend、super关键字来扩展类。

上例程：

class Person{
    constructor (name, surname, age){
        this.name = name;
        this.surname = surname;
        this.age = age;
    }
    getFullname (){
        return this.name + " " + this.surname;
    }
    static older(Person1, Person2){
        return (Person1.age >= Person2.age) ? Person1: Person2;
    }
}

var aPerson = new Person("Wang","Liwen",18);
console.log(aPerson.getFullname());

class PersonWithMiddlename extends Person{
    constructor(name, middlename, surname, age){
        super(name, surname, age);
        this.middlename = middlename;
    }
    getFullName(){
        return this.name + " " + this.middlename + " " + this.surname;
    }
}

var bPerson = new PersonWithMiddlename("Wang", "D", "Liwen", 18);
console.log(bPerson.getFullName());

重点在于：

1、重写了getFullName函数；

2、使用super关键字调用父类；

执行效果：