完善订单退款状态

src/Order/Enum/OrderEnum.php

@@ -74,9 +74,12 @@ class OrderEnum
      const BALANCE_STATE_FALSE = 0; //未对账
      const BALANCE_STATE_TRUE = 1;//已对账
 
-
-    const REFUND_SUCCESS = 2; //退款成功
+    //退款状态
+    const REFUND_NONE = 0;//无退款
+    const REFUND_PART = 1;//部分退款
+    const REFUND_SUCCESS = 2; //退款成功(全部退款)
     const REFUND_REJECTED = 3; //拒绝退款
+    const REFUND_REVOKE = 4; //买家撤销退款