front_basic/12.js_practice.html at main · luail/front_basic · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>계산기</title>
</head>
<body>
    <h2>계산 프로그램 구현</h2>
    <div>
        사칙연산선택
        <select id="start">
            <option value="plus">덧셈</option>
            <option value="minus">뺄셈</option>
            <option value="multiply">곱셈</option>
            <option value="devide">나눗셈</option>
        </select>
        <input id="input1" type="text">
        <input id="input2" type="text">
        <button onclick="calc(document.getElementById('input1').value, document.getElementById('input2').value)">연산실행</button>

    </div>
    <div id="result">결과값</div>
    <script>
        function calc(a,b) {
            const what = document.getElementById('start').value;
            console.log(a);
            let temp = 0;
            if(what == 'plus') {
                temp = Number(a)+Number(b);
            } else if(what == 'minus') {
                temp = Number(a)-Number(b);
            } else if(what == 'multiply'){
                temp = Number(a)*Number(b);
            } else {
                temp = Number(a)/Number(b);
            }
            document.getElementById('result').innerHTML=temp;
        }
    </script>
</body>
</html>