06-req-frame.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .box {
      width: 80px;
      height: 80px;
      background: orangered;
      margin: 20px;
    }
  </style>
</head>
<body>
  <button onclick="move()">MOVE</button>
  <div class="box"></div>
  <script>
    const box = document.querySelector('.box');
    let startTime = 0;
    let prevTime = 0
    const reqFrm = time => {
      console.log('TIME', prevTime - startTime);
      if (!startTime) {
        startTime = time;
      }
      if (prevTime - startTime >= 2000) return;
      box.style.transform = `translateX(${(prevTime - startTime) * 0.1}px)`;
      prevTime = time;
      window.requestAnimationFrame(reqFrm);
    };
    const move = () => {
      window.requestAnimationFrame(reqFrm);
    };
  </script>
</body>
</html>