試圖找出如何制定買 x 送 y。例如買10送1，買20送2等等。現在我只是像這樣使用這個公式。當更改為示例時，此公式將不起作用：買 5 送 1，買 10 送 2..
Ts
getFreeItem(){
let countTotal;
this.commonService.getOrderList$.subscribe((x) => {
x.filter(item => {
item.forEach((element, i) => {
if (element.freeDealMin !== null) {
item?.reduce((a, b) => {
let aVal = a?.count ? a?.count : a;
let bVal = b?.count ? b?.count : b;
countTotal = aVal bVal;
return aVal bVal;
}, 0);
let statusFree = element.freeDealMin/ countTotal;
if (statusFree == 1) {
this.freeDealQty = 1;
}else if (statusFree == 0.5) {
this.freeDealQty = 2;
}else if (statusFree == 0.33333333333) {
this.freeDealQty = 3;
}
}
});
});
});
}
uj5u.com熱心網友回復：
簡單公式：
function getFreeItem(purchaseCount,buyCount=10,freeCount=1) { // default paramters (10 items for 1 free)
let rate = Math.floor(purchaseCount / buyCount);
return rate * freeCount;
}
console.log('Buy 10, Get 1');
console.log('5', getFreeItem(5));
console.log('10',getFreeItem(10));
console.log('15',getFreeItem(15));
console.log('20',getFreeItem(20));
console.log();
console.log('Buy 5, Get 1');
console.log('5', getFreeItem(5,5));
console.log('10',getFreeItem(10,5));
console.log('15',getFreeItem(15,5));
console.log('20',getFreeItem(20,5));
console.log();
console.log('Buy 10, Get 2');
console.log('5', getFreeItem(5, 10,2));
console.log('10',getFreeItem(10,10,2));
console.log('15',getFreeItem(15,10,2));
console.log('20',getFreeItem(20,10,2));
console.log();
console.log('BOGO: Buy 1, Get 1');
console.log('5', getFreeItem(5, 1));
console.log('10',getFreeItem(10,1));
console.log('15',getFreeItem(15,1));
console.log('20',getFreeItem(20,1));
console.log();
更改引數以適合您的 BOGO 費率
uj5u.com熱心網友回復：
問題是您沒有將其指定為函式。如果你想要一個函式，添加function：
function getFreeItem(){
let countTotal;
this.commonService.getOrderList$.subscribe((x) => {
x.filter(item => {
item.forEach((element, i) => {
if (element.freeDealMin !== null) {
item?.reduce((a, b) => {
let aVal = a?.count ? a?.count : a;
let bVal = b?.count ? b?.count : b;
countTotal = aVal bVal;
return aVal bVal;
}, 0);
let statusFree = element.freeDealMin/ countTotal;
if (statusFree == 1) {
this.freeDealQty = 1;
}else if (statusFree == 0.5) {
this.freeDealQty = 2;
}else if (statusFree == 0.33333333333) {
this.freeDealQty = 3;
}
}
});
});
});
}
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標籤：javascript 数学 公式