javascript_practice/gugudan4.html at master · beaver84/javascript_practice · 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>Document</title>
</head>
<body>
    <h2>구구단 8,9단 구현</h2>
    출력할 단수: <input type="text" id="num"><br>
    <button onclick="runGugudan()">확인</button>

    <script>
        function runGugudan(){
            var strN = document.getElementById("num").value;
            var n = Number(strN);

            if ( (n < 2) || (n > 9)){
                document.write('2~9단 사이를 입력해 주세요.');
            } else {
                for (var i = 1; i < 10; i++){
                    document.write(n + ' * ' + i + ' = ' + n * i);
                    document.write('<br>');
                }
            }
        }
    </script>

</body>
</html>