//累加时长方法
function calculateCumulativeSum(array, key) {
    return array.reduce((accumulator, currentValue, currentIndex) => {
        if (currentIndex === 0) {
            accumulator[currentIndex] = currentValue[key];
        } else {
            accumulator[currentIndex] = accumulator[currentIndex - 1] + currentValue[key];
        }
        accumulator[currentIndex][key] = accumulator;
        return accumulator;
    }, []);
}

找某个数与数组中绝对差值最小的元素

  //循环找出当前时间应该播放哪个视频
  //与当前进度条最接近的 即将要播放的视频对象
  let closestObject = data.reduce((prev, current) => {
      const prevDiff = Math.abs(prev.StartFromZeroSpan - value);
      const currentDiff = Math.abs(current.StartFromZeroSpan - value);
      return prevDiff < currentDiff ? prev : current;
  });