fix: 修复 bignum 未获取值报错的问题

src/pages/afterService/components/ReturnInfoDrawer/index.tsx

@@ -2,7 +2,7 @@
  * @Author: XieZhiXiong
  * @Date: 2020-11-05 17:36:45
  * @LastEditors: XieZhiXiong
- * @LastEditTime: 2021-09-07 15:22:20
+ * @LastEditTime: 2021-09-08 20:00:03
  * @Description: 查看退货数量与退款金额 抽屉
  */
 import React, { useEffect, useState } from 'react';
@@ -240,7 +240,7 @@ const ReturnInfoDrawer: React.FC<ReturnInfoDrawerProps> = ({
       refundAmount: applyInfo.refundAmount !== undefined ?
         applyInfo.refundAmount : (
           isMateriel ?
-            +(new BigNumber(+applyInfo.remaining).multipliedBy(applyInfo.purchasePrice))
+            +(new BigNumber(+applyInfo.remaining).multipliedBy(applyInfo.purchasePrice).toFixed(2))
             : 0
       ),  // 默认赋值，如果是有支付信息的订单，退款金额 refundAmount 交给 payList 累加
     });

src/pages/afterService/returnApplication/returnPrSubmit/components/ReturnForm/index.tsx

@@ -692,7 +692,7 @@ const ReturnForm: React.FC<BillsFormProps> = ({
           id: item.id, 
           returnReason: '', 
           taskTypeKey: item.processKey, 
-          remaining: new BigNumber(item.quantity).minus(item.returnCount || 0),     // 可退货数量
+          remaining: new BigNumber(item.quantity).minus(item.returnCount || 0).toFixed(3),     // 可退货数量
           orderId: item.orderId,
         }, 
         isHasTax: item.tax,