获取指定月份的天数。

/**
 * 获取指定月份的天数
 */
static getDaysByMonth(year: number, month: number): number {
  if (month == 2) {
    let isLeapYear =(year % 4 === 0 && year % 100 !== 0) || year % 400 === 0
    if (isLeapYear) {
      return 29;
    } else {
      return 28;
    }
  } else if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
    return 31;
  } else {
    return 30;
  }
}
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