feat：卖家数量

src/Seller/Lib/SellerInterface.php

@@ -22,6 +22,8 @@ use Swoft\Core\ResultInterface;
  * @method ResultInterface deferSaveRelation($sellerId)
  * @method ResultInterface deferUpdateRelationVip($sellerId, $isVip)
  * @method ResultInterface deferCountVip($sellerId, $isVip)
+ * @method ResultInterface deferCountSeller($start, $end)
+ *
  * Interface SellerInterface
  * @package App\Lib
  */
@@ -93,4 +95,6 @@ interface SellerInterface
 	public function updateRelationVip($sellerId, $isVip);
 
 	public function countVip($sellerId);
+
+	public function countSeller($start, $end);
 }
\ No newline at end of file