code: function getRealMonthPool(monthPool) {
    let lastRealMonthIndex = 0;
    let realMonthLen = 0;
    monthPool.forEach((m, idx) => {
      if (Array.isArray(m)) {
        lastRealMonthIndex = idx;
        realMonthLen += 1;
      }
    });
    const firstRealMonthIndex = (lastRealMonthIndex - realMonthLen) + 1;
    return {
      firstRealMonthIndex,
      lastRealMonthIndex,
      realMonthLen,
    };
  }
docs: t.state.monthPool中存放一些占位信息。该function负责取出真正月份的部分信息