如何使用 Javascript 获得精确到便士的购物车结账价格？
如何使用 Javascript 获得精确到便士的购物车结账价格？
现在，在进行了所有的试用轮等之后，我正在尝试。使用 15 种高产品/价格进行测试，我的价格上涨了 1.5 美分。
for (var i = 0; i < Cookie.products.length; i++) {
boolActive = Cookie.products[i].og_active;
if (boolActive)
{
itemPrice = Cookie.products[i].price;
itemQty = Cookie.products[i].quantity;
itemDiscountPercent = Cookie.products[i].discount_percent;
subtotal = itemPrice * itemQty;
priceDiscount = (subtotal * itemDiscountPercent);
discountAmount += priceDiscount;
}
}
if (!isNaN(discountAmount))
{
var newCartTotal = (cartTotal - priceDiscount);
alert("New Cart Total: " + newCartTotal);
}
How do I get cart checkout price exact to the penny using Javascript?
Right now after taking out all of the trial .rounds etc I was trying.. I am coming up 1.5 cents too high using a high 15 products/prices to test.
for (var i = 0; i < Cookie.products.length; i++) {
boolActive = Cookie.products[i].og_active;
if (boolActive)
{
itemPrice = Cookie.products[i].price;
itemQty = Cookie.products[i].quantity;
itemDiscountPercent = Cookie.products[i].discount_percent;
subtotal = itemPrice * itemQty;
priceDiscount = (subtotal * itemDiscountPercent);
discountAmount += priceDiscount;
}
}
if (!isNaN(discountAmount))
{
var newCartTotal = (cartTotal - priceDiscount);
alert("New Cart Total: " + newCartTotal);
}
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这将为您提供值，但它将是一个字符串。如果您需要它保持数字，请使用：
that will give you the value, but it will be a string. If you need it to stay numeric, use:
您需要对每个订单项的折扣进行四舍五入：
priceDiscount = round_to_hundredth(subtotal * itemDiscountPercent)请注意，如果您添加未四舍五入的结果，然后四舍五入，则此结果可能与您得到的结果不一致。和。但是，这是手动计算发票时通常的工作方式（特别是因为每个项目可以有不同的折扣百分比，所以折扣是针对每行计算的）。
我认为您遗漏了一行内容：
discountAmount += PriceDiscount。You need to round the discount for each line item:
priceDiscount = round_to_hundredth(subtotal * itemDiscountPercent)Note that this result may not agree with the result you'd get if you add the unrounded results and then round the sum. However, this is the way invoices usually work when calculated by hand (especially since each item can have a different discount percent, so the discount is calculated for each line).
I think you left out a line saying
discountAmount += priceDiscount.将您的代码修改为：
和：
modify your code to :
and: