TIL/Manual_Counter.html at master · Bin-925/TIL · 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>
    <!-- 1 -->
    <h2>수동 카운터</h2>
    <p class="p1">0</p>
    <button class="btnPlus">더하기</button>
    <button class="btnMinus">빼기</button>
    <button class="btnReset">리셋</button>

    <script>
      // 1 수동
      const p1 = document.querySelector(".p1");
      const btnPlus = document.querySelector(".btnPlus");
      const btnMinus = document.querySelector(".btnMinus");
      const btnReset = document.querySelector(".btnReset");

      const changeBtn = function (behaviour) {
        let cnt = parseInt(p1.innerText)
        if (behaviour === 'plus') {
          cnt++
        } else if (behaviour === 'minus') {
          cnt--
        } else if (behaviour === 'reset') {
          cnt = 0
        }
        p1.innerText = cnt;
      }
      btnPlus.addEventListener("click", () => changeBtn('plus'))
      btnMinus.addEventListener("click", () => changeBtn('minus'))
      btnReset.addEventListener("click", () => changeBtn('reset'))
    </script>
  </body>
</html>