判断某个时间戳是否在当前时间（北京时区）的临近三个工作日内

function isWithinThreeWorkingDays(targetTimestamp) {
  // 将目标时间戳调整到北京时区
  var targetTimeInBeijing = targetTimestamp + 8 * 60 * 60 * 1000;

  // 获取当前时间的时间戳，并调整到北京时区
  var currentTime = new Date().getTime();
  var currentTimeInBeijing = currentTime + 8 * 60 * 60 * 1000;

  // 获取目标日期的年、月、日
  var targetDate = new Date(targetTimeInBeijing);
  var targetYear = targetDate.getFullYear();
  var targetMonth = targetDate.getMonth();
  var targetDay = targetDate.getDate();

  // 获取当前日期的年、月、日
  var currentDate = new Date(currentTimeInBeijing);
  var currentYear = currentDate.getFullYear();
  var currentMonth = currentDate.getMonth();
  var currentDay = currentDate.getDate();

  // 计算当前时间与目标时间的天数差
  var dayDiff = Math.floor((targetTimeInBeijing - currentTimeInBeijing) / (24 * 60 * 60 * 1000));

  // 判断是否在当前时间的临近三个工作日内
  if (currentYear === targetYear && currentMonth === targetMonth) {
    var targetWeekday = targetDate.getDay();
    var currentWeekday = currentDate.getDay();

    // 判断目标日期是否为周六或周日
    if (targetWeekday !== 0 && targetWeekday !== 6) {
      // 判断当前日期是否为周六或周日
      if (currentWeekday !== 0 && currentWeekday !== 6) {
        var remainingDays = targetDay - currentDay;

        // 判断是否在临近三个工作日内
        if (remainingDays >= 0 && remainingDays <= 3) {
          return true;
        }
      } else if (currentWeekday === 6 && dayDiff <= 2) {
        return true;
      } else if (currentWeekday === 0 && dayDiff <= 1) {
        return true;
      }
    } else if (targetWeekday === 6 && dayDiff <= 1) {
      return true;
    } else if (targetWeekday === 0 && dayDiff === 0) {
      return true;
    }
  } else if (currentYear === targetYear && currentMonth === targetMonth - 1) {
    var remainingDaysInCurrentMonth = new Date(currentYear, currentMonth + 1, 0).getDate() - currentDay;
    var remainingDaysInTargetMonth = targetDay;

    // 判断是否在临近三个工作日内（跨越周末）
    if (remainingDaysInCurrentMonth + remainingDaysInTargetMonth <= 3) {
      return true;
    }
  }
  return false;
}
// 示例使用
var timestamp = 1677635721000; // 给定的时间戳，2023-06-29 16:35:21
var result = isWithinThreeWorkingDays(timestamp);
console.log(result);