如何在使用javascript的网页上启用擦洗效果后正确滚动？

Question

我从codepen找到了一个代码，可用于在视频中进行擦洗效果。视频播放结束后，我要启用完整的滚动。我该如何实现？预先感谢！

var frameNumber = 0, // start video at frame 0
// lower numbers = faster playback
playbackConst = 500, 
// get page height from video duration
setHeight = document.getElementById("set-height"), 
// select video element         
vid = document.getElementById('v0'); 
// var vid = $('#v0')[0]; // jquery option

// dynamically set the page height according to video length
vid.addEventListener('loadedmetadata', function() {
  setHeight.style.height = Math.floor(vid.duration) * playbackConst + "px";
});


// Use requestAnimationFrame for smooth playback
function scrollPlay(){  
  var frameNumber  = window.pageYOffset/playbackConst;
  vid.currentTime  = frameNumber;
  window.requestAnimationFrame(scrollPlay);
}

window.requestAnimationFrame(scrollPlay);