在触摸设备上清理HTML5视频

Question

如何优化擦洗触摸屏设备视频的过程？对于鼠标，使用mousedown mousemove事件，一切都可以成功进行。但是在iPad上无法进行擦洗。var paused;var shiftX;progressBar.addEventListener('mousedown', startScrubbing);function startScrubbing(e) {    paused = video.paused;    if (!paused) video.pause();    shiftX = e.pageX - e.offsetX;    scrubbing(e);    document.addEventListener('mousemove', scrubbing);    document.addEventListener('mouseup', stopScrubbing);}function scrubbing(e) {    video.currentTime = ((e.pageX - shiftX) / progressBar.offsetWidth) * video.duration;}function stopScrubbing() {    document.removeEventListener('mousemove', scrubbing);    document.removeEventListener('mouseup', stopScrubbing);    if (!paused) video.play();}