[12일차 복습] JavaScript 기초 문법 연습

 

 

    <script>

        function hello (){
            console.log();
        }

        hello('a');


    </script>

console 값 => 아무것도 안나옴. 

 

    <script>

        function hello (b){
            console.log(b);
        }
        hello('a');

    </script>

-> a 나옴 

 

        for(i=1; i<=10; i++){
            if(i==5){
                console.log('hello world');
            }else{
                console.log(i);
            }
        }

if절 ()안에는 무조건 true or false boolean only 

 

        for(i=1; i<=15; i++){
            if(i%3==0){
                console.log('hello world');
            }else{
                console.log(i);
            }
        }

3의 배수에 hello world 쓰기 

곱하기 * 를 사용한 함수 만들어보고싶었눈데 % 가 가장 간단한듯..

 

        var b=1;
        function hello(){
            var b=2;
            console.log(b);
        }
        console.log(b);
        console.log(b);
        hello();
        console.log(b);

1121

 

=======================??????????뭘까,,,=====================

        var b=1;
        function hello(){
            var b=2;
            console.log(b);
        }
        hello();
        console.log(b);

21

        var b=1;
        function hello(){
            b=2;
            console.log(b);
        }
        hello();
        console.log(b);

22

        b=1;
        function hello(){
            var b=2;
            console.log(b);
        }
        hello();
        console.log(b);

21

        b=1;
        function hello(){
            b=2;
            console.log(b);
        }
        hello();
        console.log(b);

22 

 

 

 

 

 

        var num=0;
        function hello(){
            console.log(num);
            num++;
        }
        hello();        hello();

01 ok

 

 

 

???????????????????????????????????/

        var num=0;
        function hello(){
            console.log(num);
            num++;
        }
        hello();
        hello();
        console.log(num);

012