ladder_calculate.js
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module.exports = {
//辅助数组添加元素功能
find_in_add: function(list, ele) {
var idx=list.findIndex(function (e) {
return e.goods_id==ele.goods_id;
})
if(idx>-1) return false;
list.push(ele);
},
//辅助数组添加元素功能
find_in_remove: function(list, ele) {
var idx=list.findIndex(function (e) {
return e.goods_id==ele.goods_id;
})
if(idx==-1) return false;
list.splice(idx, 1);
},
//主要是把组合购的商品分离出来
add_ladder_prom: function(car, a, ele) {
var point = car[a];
if (point.ladder_map) {
if (point.ladder_map[ele.prom_id]) {
this.find_in_add(point.ladder_map[ele.prom_id].goods, ele);
} else {
point.ladder_map[ele.prom_id] = {
goods: [],
act: ele.act
};
point.ladder_map[ele.prom_id].goods.push(ele);
}
} else {
point.ladder_map = {};
point.ladder_map[ele.prom_id] = {
goods: [],
act: ele.act
};
point.ladder_map[ele.prom_id].goods.push(ele);
}
},
//未选中的商品，要从中剔除
remove_ladder_prom: function(car, a, ele) {
var point = car[a];
if (point.ladder_map) {
if (point.ladder_map[ele.prom_id]) {
this.find_in_remove(point.ladder_map[ele.prom_id].goods, ele);
}
}
},
//把组合购的商品价格计算出来,同时每个会员都有购买组合商品的上限！ladder_b_num是已经购买了多少件
calculate_ladder: function(car, a, th) {
var car_item = car[a];
var tfeel = 0,offline_price = 0,offline_num = 0;
var txt = "requestData[" + a + "].l_need_list";
var need_to=[];
//活动的列表都存储在这里面，可以快速查询
if (!car_item.ladder_map) {
var res = {
tfeel: tfeel,
offline_price: offline_price,
offline_num: offline_num
};
th.setData({
[txt]: null
});
return res;
}
//因为可能有多个组合购的活动
for (var mi in car_item.ladder_map) {
var bitem = car_item.ladder_map[mi];
var act = bitem.act; //获取到组合购的详情
if(!act) continue;
var all_num = 0; //商品数量之和
var all_price = 0;
var aprice=0;
var no_in_arr = []; //剩余的未加入组合购
var title =""; //提示语；
var goods = car_item.goods;
//-- 每件商品要剔除的量 --
for (let v3 in car_item.goods) {
car_item.goods[v3].l_need_downlow_num=0;
}
//寻找一下
function get_num2(ite) {
var vh=car_item.goods.findIndex(function (e) {
return e.goods_id == ite.goods_id
})
if(vh>-1) return car_item.goods[vh];
return 0;
}
for (var i in goods) {
if(goods[i].prom_type!=10) continue;
if(!goods[i].selected) continue;
if(goods[i].prom_id!=act.id) continue;
var item = goods[i];
item.goods_price=item.goods_price;
item.offline_price=item.offline_price;
item.cart_num =item.goods_num;
all_num += item.cart_num;
for (var j = 0; j < item.cart_num; j++) {
no_in_arr.push({
price: item.goods_price,offline_price:item.offline_price,goods_id:item.goods_id,shop_price:item.shop_price,goods_market_price:item.goods_market_price
})
}
}
function sortData(a, b) {
return a.price - b.price
}
no_in_arr.sort(sortData);
//开始阶梯计算价格
var lev=0;
for(let j in act.ladder_list){
if(no_in_arr.length==0) break;
let item_j=act.ladder_list[j];
var end=no_in_arr.pop();
var new_price = parseInt(item_j.discount_field) == 2?end.goods_market_price:(parseInt(item_j.discount_field) == 1 ? end.shop_price : end.price);
aprice+=new_price* parseFloat(item_j.discount)/10;
lev++;
}
//获取阶梯促销的下一个促销
if(lev>0 && lev<act.ladder_list.length){
title = "再买1件，第"+(lev+1)+"件"+act.ladder_list[lev].discount+"折";
var it = {
id: act.id,
pickup_id: car_item.pid,
title: title
};
need_to.push(it);
}
all_price+=aprice;
//算一下剩余的钱
if (no_in_arr.length) {
for (var ii in no_in_arr) {
var item = no_in_arr[ii];
var gitem=get_num2(item);
if(gitem) {
if (!gitem.l_need_downlow_num) {
gitem.l_need_downlow_num = 1;
}
else {
gitem.l_need_downlow_num++;
}
all_price += item.price;
if (item.offline_price) {
offline_price += gitem.goods_price - gitem.offline_price;
offline_num += 1;
}
}
}
}
tfeel += all_price;
}
var res = {
tfeel: tfeel,
aprice:aprice,
offline_price: offline_price,
offline_num: offline_num,
};
th.setData({ [txt]: need_to});
return res;
},
find_need_to: function(list, iter) {
if (!list || list.length <= 0) return -1;
for (var i in list) {
var item = list[i];
if (item.id == iter.id) {
return i;
}
}
return -1;
},
//筛选阶梯促销，纯粹的数组按活动id分组
find_split: function(arr) {
//过滤只有团购的商品
var oarr = arr.goods.filter(function(ele) {
return ele.prom_type == 10
})
if(!oarr || oarr.length==0) return null;
//看一下有多少个不同的团购
var map = {},dest = [];
for (var i = 0; i < oarr.length; i++) {
var ai = oarr[i];
var index=map[ai.prom_id]
if (!index) {
dest.push({
prom_id: ai.prom_id,
data: [ai]
});
map[ai.prom_id]=dest.length; //存储下标
} else {
var dj = dest[index-1];
dj.data.push(ai);
}
}
return dest;
}
}