js 动画帧

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	var start = null;
    var element = document.getElementById('SomeElementYouWantToAnimate');
    element.style.position = 'absolute';

    var progress=0;

    function step(timestamp) {
      if (!start) start = timestamp;
      progress += 50;
      element.style.left = Math.floor(progress) + 'px';
      if (progress < 1000) {
        window.requestAnimationFrame(step);
      }
    }

    window.requestAnimationFrame(step);