Source: timeLeft.js

/**
 * @desc ${startTime - endTime}的剩余时间,startTime大于endTime时，均返回0
 * @param { Date | String } startTime
 * @param { Date | String } endTime
 * @returns { Object } { d, h, m, s } 天 时 分 秒
 */
function timeLeft(startTime, endTime) {
  if (!startTime || !endTime) {
    return;
  }
  var startDate, endDate;
  if (startTime instanceof Date) {
    startDate = startTime;
  } else {
    startDate = new Date(startTime.replace(/-/g, "/")); //开始时间
  }
  if (endTime instanceof Date) {
    endDate = endTime;
  } else {
    endDate = new Date(endTime.replace(/-/g, "/")); //结束时间
  }
  var t = endDate.getTime() - startDate.getTime();
  var d = 0,
    h = 0,
    m = 0,
    s = 0;
  if (t >= 0) {
    d = Math.floor(t / 1000 / 3600 / 24);
    h = Math.floor((t / 1000 / 60 / 60) % 24);
    m = Math.floor((t / 1000 / 60) % 60);
    s = Math.floor((t / 1000) % 60);
  }
  return { d, h, m, s };
}

module.exports = timeLeft;