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判断时间戳格式是否是毫秒

/**
 * @param {Number} timeStamp 判断时间戳格式是否是毫秒
 * @returns {Boolean}
 */
const isMillisecond = timeStamp => {
  const timeStr = String(timeStamp)
  return timeStr.length > 10
}

/**
 * @param {Number} timeStamp 传入的时间戳
 * @param {Number} currentTime 当前时间时间戳
 * @returns {Boolean} 传入的时间戳是否早于当前时间戳
 */
const isEarly = (timeStamp, currentTime) => {
  return timeStamp < currentTime
}

/**
 * @param {Number} num 数值
 * @returns {String} 处理后的字符串
 * @description 如果传入的数值小于10，即位数只有1位，则在前面补充0
 */
const getHandledValue = num => {
  return num < 10 ? '0' + num : num
}

/**
 * @param {Number} timeStamp 传入的时间戳
 * @param {Number} startType 要返回的时间字符串的格式类型，传入'year'则返回年开头的完整时间
 */
const getDate = (timeStamp, startType) => {
  const d = new Date(timeStamp * 1000)
  const year = d.getFullYear()
  const month = getHandledValue(d.getMonth() + 1)
  const date = getHandledValue(d.getDate())
  const hours = getHandledValue(d.getHours())
  const minutes = getHandledValue(d.getMinutes())
  const second = getHandledValue(d.getSeconds())
  let resStr = ''
  if (startType === 'year') resStr = year + '-' + month + '-' + date + ' ' + hours + ':' + minutes + ':' + second
  else resStr = month + '-' + date + ' ' + hours + ':' + minutes
  return resStr
}

/**
 * @param {String|Number} timeStamp 时间戳
 * @returns {String} 相对时间字符串
 */
export const getRelativeTime = timeStamp => {
  // 判断当前传入的时间戳是秒格式还是毫秒
  const IS_MILLISECOND = isMillisecond(timeStamp)
  // 如果是毫秒格式则转为秒格式
  if (IS_MILLISECOND) Math.floor(timeStamp /= 1000)
  // 传入的时间戳可以是数值或字符串类型，这里统一转为数值类型
  timeStamp = Number(timeStamp)
  // 获取当前时间时间戳
  const currentTime = Math.floor(Date.parse(new Date()) / 1000)
  // 判断传入时间戳是否早于当前时间戳
  const IS_EARLY = isEarly(timeStamp, currentTime)
  // 获取两个时间戳差值
  let diff = currentTime - timeStamp
  // 如果IS_EARLY为false则差值取反
  if (!IS_EARLY) diff = -diff
  let resStr = ''
  const dirStr = IS_EARLY ? '前' : '后'
  // 少于等于59秒
  if (diff <= 59) resStr = diff + '秒' + dirStr
  // 多于59秒，少于等于59分钟59秒
  else if (diff > 59 && diff <= 3599) resStr = Math.floor(diff / 60) + '分钟' + dirStr
  // 多于59分钟59秒，少于等于23小时59分钟59秒
  else if (diff > 3599 && diff <= 86399) resStr = Math.floor(diff / 3600) + '小时' + dirStr
  // 多于23小时59分钟59秒，少于等于29天59分钟59秒
  else if (diff > 86399 && diff <= 2623859) resStr = Math.floor(diff / 86400) + '天' + dirStr
  // 多于29天59分钟59秒，少于364天23小时59分钟59秒，且传入的时间戳早于当前
  else if (diff > 2623859 && diff <= 31567859 && IS_EARLY) resStr = getDate(timeStamp)
  else resStr = getDate(timeStamp, 'year')
  return resStr
}