解决加减商品时，传的优惠券不对的问题

src/views/goods-detail.vue

@@ -304,6 +304,7 @@ export default {
       );
     },
 
+
     // 处理数据，并且先排序，再将不可用的放在最后
     handlerCouponList(couponList, goodsPrice) {
       if (!couponList.length) return [];
@@ -313,9 +314,47 @@ export default {
         firstCanCouponIndex = 0,
         item = {},
         count = 0;
-      couponList.sort( (a, b) => {
-        return b.discountAmount - a.discountAmount;
-      });
+      // couponList.sort( (a, b) => {
+      //   return b.discountAmount - a.discountAmount;
+      // });
+      for(let i = 0; i < couponList.length; i ++) {
+        item = couponList[i];
+        // couponList.forEach(item => {
+        // 要根据商品价格及券适用类型来计算
+        // item.disabled = !this.isCanSelect(item, goodsPrice);
+        item.disabled = !item.enableFlag;
+        if(!item.disabled) {
+          count ++;
+        }
+        // 是否已经选择
+        item.isChecked = !!item.checkFlag;
+        // console.log('firstCanCoupon, item.disabled', firstCanCoupon, item.disabled);
+        if (!firstCanCoupon && item.isChecked) {
+          firstCanCoupon = item;
+          firstCanCouponIndex = i;
+        }
+        newList.push(item);
+      }
+
+      this.setCurrentCoupon( JSON.parse(JSON.stringify(firstCanCoupon)) || {});
+      // this.setSelectCouponList(newList.concat(sortArray));
+      this.setSelectCouponList(newList);
+      this.goodsInfo4Coupon.count = count;
+      this.setGoodsInfo4Coupon(this.goodsInfo4Coupon);
+    },
+
+    // 处理数据，并且先排序，再将不可用的放在最后
+    handlerCouponListOld(couponList, goodsPrice) {
+      if (!couponList.length) return [];
+      let newList = [],
+        obj = {},
+        firstCanCoupon = null,
+        firstCanCouponIndex = 0,
+        item = {},
+        count = 0;
+      // couponList.sort( (a, b) => {
+      //   return b.discountAmount - a.discountAmount;
+      // });
       for(let i = 0; i < couponList.length; i ++) {
         item = couponList[i];
         // couponList.forEach(item => {
@@ -459,8 +498,8 @@ export default {
       this.isShowCoupon = false;
       this.needSortAndSelect = false;
       // 要重新调用计算价格接口
-      this.countTotalPrice();
-      // this.getTotalPrice(currentCoupon);
+      // this.countTotalPrice();
+      this.getTotalPrice(currentCoupon);
     },
 
     // tab切换
@@ -555,11 +594,12 @@ export default {
 
     // 多件商品的价格
     // TODO，要多传优惠券id参数
-    getTotalPrice(coupon) {
-      console.log('coupon', coupon);
+    getTotalPrice(currentCoupon) {
       const num = this.curtGoodsNum;
-      // this.GET(`trade/goods/getPrice/${this.goodsId}/${num}/${couponId}`, {}).then(res => {
-        const couponId = this.currentCoupon.couponId || -1;
+      let couponId = 0;
+      if(currentCoupon) {
+        couponId = currentCoupon.couponId;
+      }
       this.GET(`trade/goods/getPrice/${this.goodsId}/${num}/${couponId}`, {}).then(res => {
         if (res.code == "000000") {
           const {
@@ -580,7 +620,8 @@ export default {
           this.setGoodsInfo4Coupon(this.goodsInfo4Coupon);
           this.goodsNum = num;
           if(this.needSortAndSelect) {
-            this.handlerCouponList(this.selectCouponList, preferentialPrice || costPrice);
+            this.getCanUseCoupons(this.goodsInfo4Coupon);
+            // this.handlerCouponList(this.selectCouponList, preferentialPrice || costPrice);
           }
           this.needSortAndSelect = true;
         } else if (res.code === "200006") {
@@ -589,34 +630,6 @@ export default {
       });
     },
 
-    // 多件商品的价格
-    getTotalPriceOld() {
-      const num = this.curtGoodsNum;
-      this.GET(`trade/goods/getPrice/${this.goodsId}/${num}`, {}).then(res => {
-        if (res.code == "000000") {
-          const {
-            couponPrice,
-            preferentialPrice,
-            costPrice,
-            savePrice
-          } = res.data;
-          let price = couponPrice || preferentialPrice || costPrice;
-          this.totalPrice = {
-            ...this.formatPrice(price),
-            preferentialPrice,
-            costPrice: costPrice,
-            costPriceText: (costPrice / 100).toFixed(2),
-            savePrice: savePrice ? (savePrice / 100).toFixed(2) : 0
-          };
-          this.goodsInfo4Coupon.price = price;
-          this.setGoodsInfo4Coupon(this.goodsInfo4Coupon);
-          this.goodsNum = num;
-        } else if (res.code === "200006") {
-          this.$store.dispatch("logout");
-        }
-      });
-    },
-
     // 价格转成元、分
     formatPrice(price) {
       let yuan = (price / 100).toFixed(0);
@@ -627,6 +640,7 @@ export default {
         fen
       };
     },
+
     // 获取切换标签宽度
     getTabW() {
       if (this.tabs.length === 0) {
@@ -639,10 +653,12 @@ export default {
         this.tabW = width;
       });
     },
+
     // 轮播切换
     onSwiperChange(index) {
       this.swiperCurtIndex = index;
     },
+
     // 数量增
     onPlus() {
       this.$sendBuriedData({
@@ -666,6 +682,7 @@ export default {
       this.curtGoodsNum = num + 1;
       this.countTotalPrice();
     },
+
     // 数量减
     onReduce() {
       this.$sendBuriedData({
@@ -680,15 +697,14 @@ export default {
       this.curtGoodsNum = num - 1;
       this.countTotalPrice();
     },
-    // goLogin() {
-    //   this.$store.dispatch('goLogin');
-    // },
+
     handlerAction(type) {
       if (type === 2) {
         wxOauth();
       }
       this.isShowDialog = false;
     },
+
     // 创建订单
     createOrder() {
       this.$sendBuriedData({