function isDuringDate () {
        var curDate = new Date() //当前时间
      if (curDate >= new Date('2021-5-18 00:00') && curDate <= new Date('2021-5-18 08:30'))return true
      if (curDate >= new Date('2021-5-18 10:00') && curDate <= new Date('2021-5-18 16:30'))return true
      if (curDate >= new Date('2021-5-18 20:00') && curDate <= new Date('2021-5-18 23:30'))return true
}