日期选择器，本月、上月、上季度、本季度、上半年、下半年、本年、上一年

            <gdb-date-picker v-model="value2" type="datetimerange" :picker-options="pickerOptions" range-separator="至" start-placeholder="开始日期" end-placeholder="结束日期" align="right" :default-time="['00:00:00', '23:59:59']"></gdb-date-picker>

 pickerOptions: {
   
        shortcuts: [
          {
   
            text: '本月',
            onClick(picker) {
   
              //获取当前时间
              var currentDate = new Date()
              //获得当前月份0-11
              var currentMonth = currentDate.getMonth()
              //获得当前年份4位年
              var currentYear = currentDate.getFullYear()
              //获得上一个月的第一天
              const start = new Date(currentYear, currentMonth, 1)
              //一天的毫秒数
              var millisecond = 1000 * 60 * 60 * 24
              var aa = new Date()
              var thisMonth = aa.getMonth()
              var thisYear = aa.getFullYear()
              //求出下月第一天
              var firstDay = new Date(thisYear, thisMonth + 1, 1)
              var lastDay = new Date(firstDay.getTime() - millisecond)
              const end = new Date(lastDay)
              end.setHours(23, 59, 59, 0)
              picker.$emit('pick', [start, end])
            }
          },
          {
   
            text: '上月',
            onClick(picker) {
   
              //获取当前时间
              var currentDate = new Date()
              //获得当前月份0-11
              var currentMonth = currentDate.getMonth()
              //获得当前年份4位年
              var currentYear = currentDate.getFullYear()
              //获得上一个月的第一天
              if (currentMonth ==