iview 下拉框清空但下拉列表选中

          <Select
            v-model="vehicleTypeId"
            ref="vehicleType"
            filterable
            clearable
          >
            <Option
              v-for="item in vehicleTypeList"
              :value="item.id"
              :key="item.id"
              >{{ item.name }}</Option
            >
          </Select>
          
      this.$refs.vehicleType.clearSingleSelect();