券支付页选择每满券

“pengye”
1 parent 7e68dc05
Showing 1 changed file with 50 additions and 36 deletions
miniprogram/pack-activity/pack/buyFreeCoupon.js
--- a/miniprogram/pack-activity/pack/buyFreeCoupon.js
View file @cc269b8
+++ b/miniprogram/pack-activity/pack/buyFreeCoupon.js
View file @cc269b8
@@ -65,7 +65,6 @@ Page({
                 // console.log('listlistlist',JSON.stringify(list));
                 // list= list.concat(monidata)
                 list.forEach(detail => {
-                    detail.stringifyUse = detail.use ? JSON.stringify(detail.use) : '';
                     detail.exp_date = detail.exp_date ? util.determine(detail.exp_date) : '';
                     detail.arule = detail.arule ? util.determine(detail.arule) : '';
                     if (detail.arule) {
@@ -128,13 +127,13 @@ Page({
         const values = e.detail.value
         let arr = []
         let currentCoupon = '0'; //没选券 为0  可叠加券1  不可叠加券2
-        let inputValue = this.data.inputValue * 1
+        let inputValue = parseFloat(this.data.inputValue)
         let val = 0;
         for (let i = 0, lenI = list.length; i < lenI; ++i) {
             list[i].checked = false;
             for (let j = 0, lenJ = values.length; j < lenJ; ++j) {
                 if (list[i].activity_id === values[j]) {
-                    val += list[i].price * 1
+                    val += parseFloat(list[i].price)
                     arr.push({
                         ...list[i]
                     })
@@ -172,7 +171,11 @@ Page({
         //选的可叠加券  其他所有的不可叠加券都不可选 
         if (currentCoupon == '1') {
             list.forEach(item => {
-                if (item.accumulationShow == "0" || (remaining - item.price < 0 && !item.checked)) {
+                let kyNum = Math.floor(parseFloat(this.data.inputValue)/parseFloat(item.desc))
+                let count = list.reduce((accumulator, obj) => {
+                    return item.aid === obj.aid&&obj.checked ? accumulator + 1 : accumulator;
+                }, 0);
+                if (item.accumulationShow == "0" || ((remaining - item.price < 0) && !item.checked)||(!item.checked&&count>=kyNum)) {
                     item.showCpupon = '0';
                 } else if (item.accumulationShow == "1" && item.canCheck == '1') {
                     item.showCpupon = '1';
@@ -208,10 +211,10 @@ Page({
         })
         let price = 0;
         list.forEach(i => {
-            price += i.price * 1
+            price += parseFloat(i.price)
         })
         console.log('优惠金额----', price);
-        let val = this.data.inputValue * 1;
+        let val =  parseFloat(this.data.inputValue);
         let actualPrice = (val - price).toFixed(2)
         price = price.toFixed(2)
         this.setData({
@@ -354,7 +357,7 @@ Page({
                     selectedValue = todayArr.selectMor;
                 }
                 selectedValue = !selectedValue
-                console.log(coupon.aname, coupon.exp_date.week_show, `今天是 ${todayArr.title}，选择值为: ${selectedValue}`);
+                // console.log(coupon.aname, coupon.exp_date.week_show, `今天是 ${todayArr.title}，选择值为: ${selectedValue}`);
                 // 根据 isshow 判断法定假日是否可用
                 if (obj.isshow === "1") {
                     if (obj.can === "晚餐") {
@@ -366,7 +369,7 @@ Page({
                     }
                     str = !str
                 }
-                console.log(coupon.aname, '法定节假期', `，选择值为: ${str}`);
+                // console.log(coupon.aname, '法定节假期', `，选择值为: ${str}`);
             }
             let availableDate = true;
             if (str || selectedValue) {
@@ -401,28 +404,43 @@ Page({
         let finalList = []; //最终用的优惠券组合
         // 计算可叠加的组合
         let maxDiscount = 0;
-
-        function backtrack(startIndex, currentCombination, currentDiscount, remainingValue) {
-            // 如果当前组合的优惠大于最大优惠且剩余金额不小于0，更新最大优惠和最佳组合
-            if (currentDiscount > maxDiscount && remainingValue >= 0) {
-                maxDiscount = currentDiscount;
+        let numIndex=0
+        let closestSum = -Infinity; // 最接近或等于输入值的和
+        function backtrack(startIndex, currentCombination, currentSum,couponCount) {
+            // 如果当前和等于输入值，直接返回
+            if (currentSum == amount) {
+                closestSum = currentSum;
+                list1 = [...currentCombination];
+                return;
+            }
+            // 如果当前和小于等于输入值且更接近输入值，更新最优解
+            if (currentSum <= amount && currentSum > closestSum) {
+                closestSum = currentSum;
                 list1 = [...currentCombination];
             }
+            // 遍历数组
             for (let i = startIndex; i < validCoupons.length; i++) {
-                const coupon = validCoupons[i];
-                if (coupon.accumulationShow == '1') { // 仅考虑可叠加的优惠券
-                    const discountAmount = parseFloat(coupon.price);
-                    if (remainingValue - discountAmount >= 0) { // 确保剩余金额足够
-                        currentCombination.push(coupon);
-                        backtrack(i + 1, currentCombination, currentDiscount + discountAmount, remainingValue - discountAmount); // 递归时从 i + 1 开始
-                        currentCombination.pop(); // 回溯
-                    }
+                const obj = validCoupons[i];
+                if (obj.accumulationShow == '1') { // 仅考虑可叠加的优惠券
+                    if (currentSum*1 + obj.price*1 > amount) continue; // 如果当前和已经超过输入值，跳过
+                let kyNum = Math.floor(amount/parseFloat(obj.desc))
+                if (amount - obj.price*1 >= 0&&(!couponCount[obj.aid]||couponCount[obj.aid] < kyNum)) {
+                    couponCount[obj.aid] = (couponCount[obj.aid] || 0) + 1; // 更新使用次数
+                    currentCombination.push(obj); // 添加当前数字到组合
+                    backtrack(i + 1, currentCombination, currentSum*1 + obj.price*1,couponCount); // 递归
+                    currentCombination.pop(); // 回溯
+                    couponCount[obj.aid]--; // 回溯时减少使用次数
+                }
+                // 提前退出：如果当前和加上当前数字已经小于输入值，后续的数字也会更小
+                if (currentSum*1 + obj.price*1 < amount) break;
                 }
+                
             }
         }
-        backtrack(0, [], 0, amount); // 开始回溯
-        console.log('最佳可叠加优惠券组合:', list1);
+        const couponCount = {};
+        backtrack(0, [], 0,couponCount); // 开始回溯
         // 遍历有效优惠券，寻找不可叠加的优惠券
+        let maxNonStackableValue = 0
         validCoupons.forEach(coupon => {
             if (coupon.accumulationShow === '0') {
                 const discountAmount = parseFloat(coupon.price);
@@ -430,26 +448,22 @@ Page({
                 const finalAmount = amount - discountAmount;
                 // 确保实际支付金额不小于0，并且是最优惠的
                 if (finalAmount >= 0) {
-                    if (!list2.length || discountAmount > parseFloat(coupon.price)) {
-                        list2.push({
-                            ...coupon
-                        }); // 更新最优惠的不可叠加券
+                    if (maxNonStackableValue<discountAmount) {
+                        maxNonStackableValue = discountAmount
+                        list2=[{...coupon}]
                     }
                 }
             }
         });
-        console.log('可叠加的优惠券组合2', list1);
+        console.log('可叠加优惠券组合', list1);
         console.log('不可叠加的优惠券', list2);
         // 计算两个列表的最大优惠值
         let maxStackableValue = list1.reduce((total, coupon) => total + parseFloat(coupon.price), 0);
-        let maxNonStackableValue = list2.reduce((total, coupon) => total + parseFloat(coupon.price), 0);
         // 比较两个最大值并输出结果
         if (maxStackableValue > maxNonStackableValue) {
-            console.log(`可叠加优惠券组合的最大优惠值更高: ${maxStackableValue}`);
             finalList = list1
         } else if (maxStackableValue < maxNonStackableValue) {
-            console.log(`不可叠加券的最大优惠值更高: ${maxNonStackableValue}`);
             finalList = list2
         } else {
             console.log(`两者的优惠值相同: ${maxStackableValue}`);
@@ -470,11 +484,11 @@ Page({
         let discountPrice = 0;
         // 更新选中的优惠券
         finalList.forEach(coupon => {
-            let target = arr.find(obj => obj.activity_id === coupon.activity_id);
-            if (target) {
-                target.showCpupon = 1;
-                target.checked = true;
-                discountPrice += coupon.price * 1; // 使用 parseFloat 确保类型正确
+            let target = arr.findIndex(obj => obj.activity_id === coupon.activity_id);
+            if (target>-1) {
+                arr[target].showCpupon = 1;
+                arr[target].checked = true;
+                discountPrice += parseFloat(coupon.price); // 使用 parseFloat 确保类型正确
             }
             console.log('选中的券', {
                 ...coupon