JavaScript 데이터 저장하기 객체

10. 객체 : 데이터를 저장(키와 값) 표현방법1

{
    const obj = new Object();
    obj[0] = 100;
    obj[1] = 200;
    obj[2] = "Javascript";
    
    document.write("*** 10. 객체 ***");
    document.write(obj[0]);
    document.write(obj[1]);
    document.write(obj[2]);
}

결괏값

100
200
Javascript

11. 객체 : 데이터를 저장(키와 값) 표현방법2

{
    const obj = new Object();
    obj.a = 100;
    obj.b = 200;
    obj.c = "Javascript";
    
    document.write("*** 11. 객체 ***");
    document.write(obj.a);
    document.write(obj.b);
    document.write(obj.c);
}

결괏값

100
200
Javascript

12. 객체 : 데이터를 저장(키와 값) 표현방법3

{
    const obj = {};
    obj.a = 100;
    obj.b = 200;
    obj.c = "Javascript";
    
    document.write("*** 12. 객체 ***");
    document.write(obj.a);
    document.write(obj.b);
    document.write(obj.c);
}

결괏값

100
200
Javascript

13. 객체 : 데이터를 저장(키와 값) 표현방법4

{
    const obj = {a: 100, b: 200, c:"Javascript"};

    document.write("*** 13. 객체 ***");
    document.write(obj.a);
    document.write(obj.b);
    document.write(obj.c);
}

결괏값

100
200
Javascript

14. 객체 : 데이터를 저장(키와 값) 표현방법5

{
    const obj = [
    {a: 100, b: 200},
    {c: "javascript"}
    ];

    document.write("*** 14. 객체 ***");
    document.write(obj[0].a);
    document.write(obj[0].b);
    document.write(obj[1].c);
}

결괏값

100
200
Javascript

15. 객체 : 데이터를 저장(키와 값) 표현방법6

{
    const obj = {
        a:100,
        b: [200, 300],
        c: {x: 400, y: 500},
        d: "Javascript"
    }

    document.write("*** 15. 객체 ***");
    document.write(obj.a);
    document.write(obj.b[0]);
    document.write(obj.b[1]);
    document.write(obj.c.x);
    document.write(obj.c.y);
    document.write(obj.d);
}

결괏값

100
200
300
400
500
Javascript

16. 객체 : 데이터를 저장(키와 값) 표현방법7

{
    const a = 100;
    const b = 200;
    const c = "Javascript";

    const obj = { a, b, c }

    document.write("*** 16. 객체 ***");
    document.write(obj.a);
    document.write(obj.b);
    document.write(obj.c);
}

결괏값

100
200
Javascrip

17. 객체 : 데이터를 저장(키와 값) 표현방법8

{
    const obj = {
        a: 100,
        b: [200, 300],
        c: {x:400, y:500},
        d: "Javascript",
        e: function(){
            document.write("Javascript가 실행되었습니다.");
        },
        f: function(){
            document.write(obj.d + "가 실행되었습니다.")
        },
        g: function(){
            document.write(this.d + "가 실행되었습니다.")
        }
    }

    document.write("*** 17. 객체 ***"");
    document.write(obj.a);
    document.write(obj.b);
    document.write(obj.b[0]);
    document.write(obj.b[1]);
    document.write(obj.c.x);
    document.write(obj.c.y);
    document.write(obj.d);
    obj.e();
    obj.f();
    obj.g();    
}

결괏값

100
200,300
200
300
400
500
javascript가 실행되었습니다.
javascript가 실행되었습니다.
javascript가 실행되었습니다.

 

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