将数字转换为枚举

enum Weekday {
  Monday,
  Tuesday,
  Wednesday,
  Thursday,
  Friday,
  Saturday,
  Sunday
}

Weekday day;

switch (dayNumber) {
  case 1:
    day = Weekday.Monday;
    break;
  case 2:
    day = Weekday.Tuesday;
    break;
  case 3:
    day = Weekday.Wednesday;
    break;
  case 4:
    day = Weekday.Thursday;
    break;
  case 5:
    day = Weekday.Friday;
    break;
  case 6:
    day = Weekday.Saturday;
    break;
  case 7:
    day = Weekday.Sunday;
    break;
  default:
    // 处理无效的数字值
    break;
}

if (day == Weekday.Saturday || day == Weekday.Sunday) {
  console.log("It's the weekend!");
} else {
  console.log("It's a weekday.");
}