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JavaScript 객체의 개념(method, Array 객체)

Canyi 2022. 10. 19. 11:56 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>객체</title>
</head>
<body>
    <script>


        var charTest = 'test1';
        document.write(charTest.charAt([2])) ;


    </script>
</body>
</html>

결과값

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>객체</title>
</head>
<body>
    <script>

        var charTest = '0123456789';
        document.write(charTest.charAt([2]) +"</br>");   //charAt(indexPosition)
        document.write(charTest.slice(2,4)+"</br>");	 //substring(startindex, endindex)
        document.write(charTest.substring(2,4)+"</br>"); //substring(startindex, endindex)
        document.write(charTest.substr(4,4)+"</br>");    //substr(startindex, indexlength)


    </script>
</body>
</html>

 

 

JavaScript에서 직접 string값 컨트롤하기

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>객체</title>
</head>
<body>
    <script>

        
        var str = '테스트합니다.';
        var name = 'canyi';
        var mystr = str.fontcolor('blue');
        mystr = mystr.fontsize(10);     //글꼴 크기
        mystr = mystr.italics();        //글꼴 변경
        mystr = mystr.bold();           //볼더 굵게
        mystr = mystr + '' + name.sub();  //붙이기

        document.write(mystr);


    </script>
</body>
</html>

 

 

 

 

동적으로 메모리 할당

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>객체</title>
</head>
<body>
    <script>

        //Array

        var month = new Array(1,2,3,4,5,6,7,8,9,10,11,12);

        alert(month[0]);
        alert(month[9]);

        month.push(13);         //동적으로 heap memory 할당
        alert(month[12]);

    </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>객체</title>
</head>
<body>
    <script>

        var month = new Array(1,2,3,4,5,6,7,8,9,10,11,12);

        for(var i=0; i < month.length; i++)
        {
            document.write(month[i] + '월</br>');
        }

    </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>객체</title>
</head>
<body>
    <script>

        var major = new Array("컴공", "전자전기", "제어공학");
        var minor = new Array("중국어", "한국어", "일본어");

        var total = major.concat(minor);
        document.write("전공 합치기" + total +"</br>");    //배열 합치기

        document.write("리스트 역순" +total.reverse());	  //배열 역순

    </script>
</body>
</html>

 

배열을 역순하고 오름차순 정렬하기

 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>객체</title>
</head>
<body>
    <script>
    
        var month = new Array(1,2,3,4,5,6,7,8,9,10,11,12);

        document.write("월별 배열 역순하기:" + month.reverse()+"</br>");

        var letReverse = month.reverse();
        
        var sortReverse  = letReverse.sort(function(left,rigth) {
            
            return left - rigth;
        })

        document.write("월별 배열 오름차순:" + sortReverse);
        

    </script>
</body>
</html>

 

 

 

Function() 객체

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>객체</title>
</head>
<body>
    <script>

        //Function() 객체

        var myAdd = new Function('x','y','return(x+y)');
        alert('두수의 합 :' + myAdd(10,20));

    </script>
</body>
</html>