JavaScript/MonthSeason.html at master · BBoBBoM/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>Document</title>
  </head>
  <body>
    <script>
      let input;
      while (true) {
        input = Number(prompt("월을 입력해주세요", ""));
        if (!isNaN(input)) {
          break;
        } else {
          alert("유효한 수를 입력해주세요");
        }
      }

      const spring = input >= 3 && input < 6;
      const summer = input >= 6 && input < 9;
      const fall = input >= 9 && input < 12;
      const winter = input == 12 || (input >= 1 && input < 3);
      if (spring) {
        alert("봄입니다.");
      }
      if (summer) {
        alert("여름입니다.");
      }
      if (fall) {
        alert("가을입니다.");
      }
      if (winter) {
        alert("겨울입니다.");
      }
    </script>
  </body>
</html>