城市三级联动使用

<FormItem
                        :label="t('region.region_area')"
                        type="city"
                        v-model="baTable.form.items!.region_area"
                        prop="region_area"
                        :placeholder="t('Please select field', { field: t('region.region_area') })"
                        :attr="{
                            'expandTrigger': true,
                        }"
                    />