> object(객체)
자바 스크립트는 객체 기반의 스크립트 언어.
객체의 구성요소로는 property , method가 존재한다. (객체는 이들을 감싸고 있는 껍데기와 같은 느낌으로 이해!)
property : key , value 한쌍으로 이루어짐 / 데이터
key : 빈 문자열을 포함하는 모든 문자열 또는 symbol값
value : 모든 값
method : 데이터를 참조하고 조작할 수 있는 동작(behavior)
자바스크립트의 객체는 객체 지향의 상속을 구현하기 위해 프로토타입(prototype)이라고 불리는 객체의 프로퍼티와 메소드를 상속 받을 수 있다. 이 프로토 타입은 타 언어와 구별되는 중요한 개념.
Object Literal Notaion:
var object = {};Bracket Notation:
object['property']=value;Dot Notation
object.property = value;Object Constructor Functions (생성자 함수)
// 빈 객체 생성
var person = new Object();
// 프로퍼티 추가
person.name = 'lee';
person.gender = 'male';
console.log(typeof person); // object
console.log(person); // {name:"lee", gender:"male"}//1. 생성자 함수를 작성하여 객체를 정의.
//2. new 키워드를 사용하여 객체의 인스턴스 생성
function book (page, writer, years, novel, codeNumnber){
this.book = book;
this.writer = writer;
this.years = years;
this.novel = novel;
this.codeNumnber = codeNumnber;
}
var book1 = new Book(500, 'yoon', '1995', true, 56);
console.log(book1);
//JavaScript Beginner Bootcamp (2021)
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