var mons = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
  function isLeapYear(year) {
    var  r = year / 100
    if (r === parseInt(r)) {
      r = year / 400
      return r === parseInt(r)
    }
    r = year / 4
    if (r === parseInt(r)) {
      return true
    }
    return false
  }

  function getDaysOfMonth(month, year) {
    if (month === 2 && isLeapYear(year)) {
      return 29
    }
    return mons[month]
  }

  function getMonthsOfYear(year) {
    if (isLeapYear(year)) {
      return 366
    }
    return 365
  }

  function diff(s1, s2) {
    var arr1 = s1.split('-').map(Number)
    var arr2 = s2.split('-').map(Number)
    var [year, month, day] = arr2.map((n, i) => n - arr1[i])
    if (day < 0) {
      day += getDaysOfMonth(arr2[1], arr2[0])
      month--
    }
    if (month < 0) {
      month += getMonthsOfYear(arr2[0])
      year--
    }
    return [year, month, day]
  }

打印接口浏览打印页面回显数据

      printInitialCheckTable(row) {
        getPrint({
          chdeId: row.chdeChilId
        }).then(((res) => {
          if (res.data.code && res.data.code === '100000') {
            this.initialCheckInfo = res.data.data
            //计算死亡时龄
            var d1_str = this.initialCheckInfo.chilBirthDate
            var d2_str = this.initialCheckInfo.chdeDeathTime
            this.$set(this.initialCheckInfo, 'deathage', diff(d1_str, d2_str))
            this.$nextTick(() => {
              this.handlePrint('print-table')
            })
          } else {
            this.$Message.error({
              content: res.data.message,
              duration: 3,
              closable: true
            })
            this.$nextTick(() => {
              this.handlePrint('print-table')
            })
          }
        }))
      },

data中初始化值

          initialCheckInfo: {
            deathage:[0,0,0]
          },

打印页面回显数据

<td colspan="2" style="width:50%;padding:5px;">
    <span style="padding-right:20px">死亡日龄</span>
    <span>{{dataSource.deathage[1]}}月{{dataSource.deathage[2]}}天</span>
</td>