javascript/app01.html at master · sangmin0816/javascript · 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>자바스크립트 응용 01 - 계산기</title>
    <style>
        @font-face {
            font-family: digital;
            src: url("./digital-7.ttf");
        }
        * {font-size: 20px;}
        input {width: 300px; height: 50px; border-radius: 5px; font-family: digital, sanserif; font-size: 30px; margin-top: 40px; background-color: rgba(250, 255, 195, 0.641); margin-bottom: 30px; text-indent: 8px;}
        button {width: 60px; height: 60px; box-shadow: 1px 2px 1px 1px rgba(112, 128, 144, 0.8); border-radius: 100%;}
        button:active{background-color: rgb(222, 222, 222); box-shadow: 1px 2px 1px 1px rgba(112, 128, 144, 0.8) inset;}
        table {width: 100%;}
        tr {display: flex; justify-content: space-between; margin-bottom: 10px;}
        .cal_wrap {background-color: rgb(0, 107, 45); padding: 20px; width: fit-content; height: fit-content; border-radius: 10px; padding-bottom: 60px; box-shadow: 3px 3px 2px 1px rgba(112, 128, 144, 0.8);}
    </style>
</head>
<body style="margin: 10px;">
    <h2>상민이의 계산기</h2>
    <div id="calculator" style="display: flex; justify-content: center; align-items: center;">
        <div class="cal_wrap">
            <input type="text" id="display">
            <table>
                <tr>
                    <td><button id="btn7">7</button></td>
                    <td><button id="btn8">8</button></td>
                    <td><button id="btn9">9</button></td>
                    <td><button id="btn/">/</button></td>
                </tr>
                <tr>
                    <td><button id="btn4">4</button></td>
                    <td><button id="btn5">5</button></td>
                    <td><button id="btn6">6</button></td>
                    <td><button id="btn*">*</button></td>
                </tr>
                <tr>
                    <td><button id="btn1">1</button></td>
                    <td><button id="btn2">2</button></td>
                    <td><button id="btn3">3</button></td>
                    <td><button id="btn-">-</button></td>
                </tr>
                <tr>
                    <td><button id="btn0">0</button></td>
                    <td><button id="btn.">.</button></td>
                    <td><button id="calc" onclick="calc()">=</button></td>
                    <td><button id="btn+">+</button></td>
                </tr>
            </table>
        </div>
    </div>
    <script>
        var btn = document.querySelectorAll("button[id^='btn']")
        var display = document.getElementById("display");
        for(var i=0; i<btn.length; i++){
            btn[i].addEventListener("click", function(e){
                display.value+=e.target.innerText;
            })
        }
        display.addEventListener("keypress", function(e){
            console.log(typeof(e))
            display.value += e.target.innerText;
        })

        function calc(){
            try {
                display.value = eval(display.value);
            } catch (error) {
                display.value = "";
            alert("input error");
            }
        }
    </script>
</body>
</html>