问题修复，下单修复

utils/coupon.js

@@ -0,0 +1,45 @@
+import {
+	findCoupon
+} from '@/common/api/market/coupon.js';
+import * as UTILS from '@/utils/goods-utils.js'
+export async function returnHasCouponCanUse(args) {
+	const {
+		goodsOrderPrice,
+		dinnerType,
+		shopId,
+		shopInfo,
+		shopUserId,
+		allGoods,
+		user
+	} = args
+	const res = await findCoupon({
+		shopUserId,
+	});
+	if(!res||res.length<=0){
+		return false
+	}
+
+	const canDikouGoodsArr = UTILS.returnCanDikouGoods(allGoods, [], user);
+	for (let i = 0; i < res.length; i++) {
+		const coupon = res[i]
+		const canuseResult = UTILS.returnCouponCanUse({
+			canDikouGoodsArr,
+			coupon,
+			goodsOrderPrice,
+			user,
+			selCoupon: [],
+			shopInfo
+		})
+		const {
+			canUse,
+			reason
+		} = canuseResult
+		if (canUse) {
+			return true
+		} 
+	}
+	
+	return false
+	
+
+}

utils/goods-utils.js

@@ -12,6 +12,9 @@ import _ from "lodash";
  * @param {Object} shopInfo
  */
 export function returnGoodsPrice(goods, user, shopInfo) {
+	if(!goods){
+		return 0
+	}
 	if (goods.discount_sale_amount * 1 > 0) {
 		return goods.discount_sale_amount;
 	}
@@ -65,22 +68,38 @@ export function returnCoupType(coupon) {
  * @param user 用户信息
  */
 export function returnCanDikouGoodsArr(canDikouGoodsArr, selCoupon, user) {
-	const goodsCouponGoods = selCoupon
-		.filter((v) => v.type == 2)
-		.reduce((prve, cur) => {
-			prve.push(...cur.discount.hasDiscountGoodsArr);
-			return prve;
-		}, []);
-	const arr = _.cloneDeep(canDikouGoodsArr)
-		.map((v) => {
-			const findCart = goodsCouponGoods.find((carts) => carts.id == v.id);
-			if (findCart) {
-				v.num -= findCart.num;
-			}
-			return v;
-		})
-		.filter((v) => v.num > 0);
-	return arr;
+  const types = [2, 4, 6];
+  // 收集已抵扣商品并关联对应的优惠券类型
+  const goodsCouponGoods = selCoupon
+    .filter((v) => types.includes(v.type))
+    .reduce((prev, cur) => {
+      // 给每个抵扣商品添加所属优惠券类型
+      const goodsWithType = cur.discount.hasDiscountGoodsArr.map(goods => ({
+        ...goods,
+        couponType: cur.type // 记录该商品是被哪种类型的优惠券抵扣的
+      }));
+      prev.push(...goodsWithType);
+      return prev;
+    }, []);
+
+  const arr = _.cloneDeep(canDikouGoodsArr)
+    .map((v) => {
+      const findCart = goodsCouponGoods.find((carts) => carts.id == v.id);
+      if (findCart) {
+        // 根据优惠券类型判断扣减数量
+        if ([4, 6].includes(findCart.couponType)) {
+          // 类型4（第二件半价）或6（买一送一），数量减2
+          v.num -= 2;
+        } else {
+          // 其他类型（如类型2商品券），按原逻辑扣减对应数量
+          v.num -= findCart.num;
+        }
+      }
+      return v;
+    })
+    .filter((v) => v.num > 0); // 过滤掉数量<=0的商品
+
+  return arr;
 }
 
 /**
@@ -151,12 +170,18 @@ export function returnCouponCanUse(args) {
 
 	// 商品券特殊验证
 	if (coupon.type === 2) {
-		if (!(isDikouAll || canCalcGoodsArr.length > 0)) {
+		if (!(isDikouAll || canCalcGoodsArr.length === 0)) {
 			return {
 				canUse: false,
 				reason: "没有符合条件的商品可抵扣"
 			};
 		}
+		if(canDikouGoodsArr.length<=0){
+			return 	 {
+				canUse: false,
+				reason: "没有符合条件的商品可抵扣"
+			};
+		}
 	}
 
 	// 买一送一券特殊验证
@@ -241,7 +266,6 @@ export function calcDiscountGoodsArrPrice(discountGoodsArr, discountNum, user,sh
  * @param selCoupon 已选择的优惠券列表
  */
 export function returnCouponDiscount(arr, coupon, user, goodsOrderPrice, selCoupon) {
-	console.log('arr', arr);
 	const canDikouGoodsArr = returnCanDikouGoodsArr(arr, selCoupon, user);
 	console.log('canDikouGoodsArr', canDikouGoodsArr);
 	if (coupon.type == 2) {
@@ -291,7 +315,7 @@ export function returnCouponZhekouDiscount(
 	// 2. 计算优惠比例：1 - 折扣率（例如：8折的优惠比例是 1 - 0.8 = 0.2）
 	const discountAmountRatio = new BigNumber(1).minus(discountRatio);
 	// 3. 计算折扣金额：商品订单金额 × 优惠比例
-	let discountPrice = new BigNumber(goodsOrderPrice).times(discountAmountRatio).toNumber();
+	let discountPrice = new BigNumber(goodsOrderPrice).times(discountAmountRatio).decimalPlaces(2, BigNumber.ROUND_FLOOR).toNumber();
 	if (maxDiscountAmount != 0) {
 		discountPrice = discountPrice >= maxDiscountAmount ? maxDiscountAmount : discountPrice;
 	}