有时，我们会把时长格式化成时分秒展示

具体实现

export function duration(timeStamp) {
  let hour = parseInt((timeStamp % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
  let minute = parseInt((timeStamp % (1000 * 60 * 60)) / (1000 * 60));
  let second = parseInt((timeStamp % (1000 * 60)) / 1000);
  hour = hour < 10 ? ('0' + hour) : hour;
  minute = minute < 10 ? ('0' + minute) : minute;
  second = second < 10 ? ('0' + second) : second;
  return hour + ':' + minute + ':' + second;
}