合并折扣
了解在购物车中应用多个折扣的影响。
组合百分比折扣和货币折扣
您可以应用以下折扣：
针对订单项、购物车或前两者的百分比折扣
针对订单项目、购物车或前两者的货币折扣
订单项目折扣和购物车折扣的组合。
如果您创建了一个合并折扣，则会首先应用货币订单项折扣，然后再应用百分比购物车折扣，如下所示：
产品原始价格 = 20.00
货币订单项折扣 = 5.00
产品价格（减去货币折扣）：20.00 - 5.00 = 15.00
百分比购物车折扣 = 10%
百分比折扣值：15.00 x 0.1 = 1.50
最终产品价格（减去所有折扣）：15.00 - 1.50 = 13.50
销售多个数量的折扣商品
如果购物车包含多个某种产品，并且该产品具有货币订单产品折扣，则该折扣仅应用一次：
产品价格 =（数量 x 打折前的价格）-（货币折扣）
如果您想多次兑现订单项折扣，可以采用两种方式：
计算折扣的总额，并将该数字用作订单项目的折扣。
按百分比应用折扣。
Shopify商户官网原文详情：
Combining discounts
Learn about the effects of applying more than one discount in the cart.
Combine percentage and monetary discounts
You can apply the following discounts:
a percentage discount on a line item, on the cart, or on both
a monetary discount on a line item, on the cart, or on both
a combination of line-item discounts and one cart discount.
If you create a combination discount, then the monetary line-item discount is applied before the percentage cart discount, like this:
Original product price = 20.00
Monetary line-item discount = 5.00
Product price (less the monetary discount): 20.00 - 5.00 = 15.00
Percentage cart discount = 10%
Value of percentage discount: 15.00 x 0.1 = 1.50
Final product price (less all discounts): 15.00 - 1.50 = 13.50
Sell multiple quantities of a discounted item
If the cart contains multiple quantities of a product that attracts a monetary line-item discount, then the discount is applied only once:
Product Price = (Quantity x Pre-discount price) - (Monetary discount)
If you want to honor a line-item discount multiple times, then you have two options:
Calculate the sum of the discounts and use that figure as the line-item discount.
Apply the discount as a percentage instead.
文章内容来源：Shopify商户官方网站
