javascript-mini-game/calculator.html at main · youngsikkk/javascript-mini-game · 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>
  <input readonly id="operator">
  <input readonly id="result" type="number">
  <div class="row">
    <button id="num-7">7</button>
    <button id="num-8">8</button>
    <button id="num-9">9</button>
    <button id="plus">+</button>
  </div>
  <div class="row">
    <button id="num-4">4</button>
    <button id="num-5">5</button>
    <button id="num-6">6</button>
    <button id="minus">-</button>
  </div>
  <div class="row">
    <button id="num-1">1</button>
    <button id="num-2">2</button>
    <button id="num-3">3</button>
    <button id="devide">/</button>
  </div>
  <div class="row">
    <button id="clear">C</button>
    <button id="num-0">0</button>
    <button id="equal">=</button>
    <button id="multiple">*</button>
  </div>
  <style>
    * {box-sizing: border-box;}
    #result {width: 182px; height: 50px; margin: 5px; text-align: right;}
    #operator {width: 50px; height: 50px; margin: 5px; text-align: center;}
    button {width: 50px; height: 50px; margin:5px;}
  </style>
  <script>
    let numOne = "";
    let numTwo = "";
    let operator = "";
    const handleClick = (e) => {
      if (!operator) {
        numOne += e.target.textContent;
        $result.value = numOne;
      } else {
        numTwo += e.target.textContent;
        $result.value = numTwo;
      }
    }
    const handleClickOperator = (e) => {
      if (!numOne || $operator.value.length>=1) {
        alert('잘못된 입력입니다.');
      }
      else {
        operator += e.target.textContent;
        $operator.value = operator;
      }
    }
    const $result = document.querySelector("#result");
    const $operator = document.querySelector("#operator");
    document.querySelector("#num-1").addEventListener("click", handleClick);
    document.querySelector("#num-2").addEventListener("click", handleClick);
    document.querySelector("#num-3").addEventListener("click", handleClick);
    document.querySelector("#num-4").addEventListener("click", handleClick);
    document.querySelector("#num-5").addEventListener("click", handleClick);
    document.querySelector("#num-6").addEventListener("click", handleClick);
    document.querySelector("#num-7").addEventListener("click", handleClick);
    document.querySelector("#num-8").addEventListener("click", handleClick);
    document.querySelector("#num-9").addEventListener("click", handleClick);
    document.querySelector("#num-0").addEventListener("click", handleClick);
    document.querySelector("#minus").addEventListener("click", handleClickOperator);
    document.querySelector("#plus").addEventListener("click", handleClickOperator);
    document.querySelector("#devide").addEventListener("click", handleClickOperator);
    document.querySelector("#multiple").addEventListener("click", handleClickOperator);
    document.querySelector("#clear").addEventListener("click", () => {
      numOne = "";
      numTwo = "";
      operator = "";
      $operator.value = "";
      $result.value = "";
    });
    document.querySelector("#equal").addEventListener("click", () => {
      if (!numOne || !numTwo) { alert("잘못된 입력입니다"); }
      else {
         switch (operator) {
          case "+":
            $result.value = parseInt(numOne) + parseInt(numTwo);
            operator = "";
            $operator.value = "";
            numOne = parseInt(numOne) + parseInt(numTwo);
            numTwo = "";
            break;
          case "-":
            $result.value = parseInt(numOne) - parseInt(numTwo);
            operator = "";
            $operator.value = "";
            numOne = parseInt(numOne) - parseInt(numTwo);
            numTwo = "";
            break;
          case "*":
            $result.value = parseInt(numOne) * parseInt(numTwo);
            operator = "";
            $operator.value = "";
            numOne = parseInt(numOne) * parseInt(numTwo);
            numTwo = "";
            break;
          case "/":
            $result.value = parseInt(numOne) / parseInt(numTwo);
            operator = "";
            $operator.value = "";
            numOne = parseInt(numOne) / parseInt(numTwo);
            numTwo = "";
            break;
        }
      }
    });
  </script>
</body>
</html>