    <!DOCTYPE html>
    <html>
    <head>
      <meta charset="UTF-8">
      <title>input과 무작위 수 사용하기</title>
      <link rel="stylesheet" href="style_js.css">
    <body>
      음식 1개당 1200원입니다. 얼마 내실래요?<hr>
      <input type="text" id="input">
      <button onclick="randomFood()">order</button>
      <script>
        function randomFood() {
          const money = parseInt(document.getElementById('input').value);
          const fnum = Math.floor(money / 1200);
          const change = money - (fnum * 1200);
          if (money >= 1200) {
            for (let i = 1; i <= fnum ; i++) {
              food = Math.floor(Math.random() * 3) + 1;
              document.write(i + "<img src='../media/food" + food + ".png'>");
            }
            document.write("<h3>합:" + fnum * 1200 + ", 반환:" + change + "</h3>");
          } else
            document.write("금액이 모자랍니다");
        }
      </script>
    </body>
    </html>