根据月份计算第一天和最后一天, 通过2023-12得到 2023-12-01 和 2023-12-31

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function getMonthStartEnd (paramDate) {
    if (!paramDate) return
    paramDate = decodeURIComponent(paramDate)
    paramDate = paramDate.split('-')
    const day = 1 * 24 * 60 * 60 * 1000
    const year = paramDate[0]
    const month = paramDate[1]
    const sdate = new Date()
    sdate.setFullYear(year)
    sdate.setMonth(month - 1)
    sdate.setDate(1)
    let edate = new Date(sdate)
    edate.setMonth(month)
    edate = new Date(edate - day)
    return {
      s: formatDate(sdate, 'YYYY-MM-dd'),
      e: formatDate(edate, 'YYYY-MM-dd'),
    }
  }
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console.log(getMonthStartEnd('2023-12')) // {s: 2023-12-01, e: 2023-12-31}