Fix： 【商城小程序】结算页面直接默认使用当前可用减免金额最大的优惠券

components/CouponsPopup.vue

@@ -159,7 +159,9 @@ export default {
     largOne() {
       if(this.list[this.maxIndex]) {
         this.selectCoupon(this.list[this.maxIndex].id)
+        uni.setStorageSync('couponId', this.list[this.maxIndex].id)
       }
+      this.$emit('max', this.list[this.maxIndex] || {})
       return this.list[this.maxIndex] || {}
     }
     

pages/order/OrderSubmission/index.vue

@@ -109,7 +109,7 @@
             </view>
           </view>
           <view class="v12-justify-between v12-align-center">
-            <view class="v12-mr-2" @click="changeCoupons" v-if="couponList.usable.length === 0">
+            <view class="v12-mr-2" @click="changeCoupons" v-if="couponList.usable.length !== 0">
               <text class="v12-dark-text v12-font-24" >{{ couponList.usable.length === 0 ? '无' : '去选择' }}</text>
               <text class="iconfont icon-jiantou v12-font-24 v12-dark-text"></text>
             </view>
@@ -252,6 +252,7 @@
         :two-list="couponList"
         @change="changeCoupons"
         :currentPrice="force2Decimal(orderPrice.totalPrice)"
+        @max="couponMax"
         :show-tab="false"
       />
     </u-popup>
@@ -417,6 +418,10 @@ export default {
   },
   methods: {
     isNullOrEmpty,
+    couponMax(e) {
+      this.couponTitle = e.couponTitle
+      this.couponId = uni.getStorageSync('couponId') || 0
+    },
     showStoreList() {
       this.$store.commit("get_to", "orders");
       this.$yrouter.push({
@@ -769,7 +774,7 @@ export default {
     },
     // v9-2
     changeCoupons(item) {
-      
+      if(!item) return
       if (this.couponList.usable.length === 0) return
       this.show = !this.show
       this.couponId = uni.getStorageSync('couponId') || 0