transfile/javascript_test.html at master · simseonbeom/transfile · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>javascript_test</title>

    <style>
        .box{
            width:200px;
            height :200px;
            background: red;
        }
    </style>
</head>
<body>


<div class="box"></div>


<script>


    const userName = "착한호랑이"; //string
    const age = 43; // number
    const married = false; //boolean
    let girlFriend; //undefined
    const money = null; //null


    console.log(typeof userName);
    console.log(typeof age);
    console.log(typeof married);
    console.log(typeof girlFriend);
    console.log(typeof money);


    console.log(2-3);
    console.log(userName === '착한호랑이');
    console.log(age < 30);


    if(userName === '나쁜호랑이'){
        console.log('정답!');
    }else{
        console.log('오답!');
    }

    if(userName === '어벙한호랑이'){
        console.log('안녕 난 어벙한 호랑이야');
    }else if(userName === '멍청한호랑이'){
        console.log('안녕 난 멍청한 호랑이야');
    }else if(userName === '나쁜호랑이') {
        console.log('안녕 난 나쁜 호랑이야');
    }else{
        console.log('안녕 난 착한 호랑이야');
    }


    //  정의   조건   갱신
    for(let i = 0; i<100; i++){

        console.log(i + '번이야');

    }

    // document.getElementsByClassName('box');

    // const box = document.querySelectorAll('.box');
    const box = document.querySelector('.box');

    console.log(box);


</script>

</body>
</html>