如何根据日期计算预订价格

如何解决如何根据日期计算预订价格

如果此范围内没有日期，如何在下面的代码中添加条件，为costRate分配一个固定值？

        function getPrices(allSeasons,checkin,checkout) {
            const day = 1000*60*60*24;
            return allSeasons.reduce( (totalPrice,season) => {
                let daysInSeason = Math.round(
                    (Math.min(+season.endDate+day,checkout) 
                    - Math.max(season.startDate,checkin)) / day);
                return totalPrice + (daysInSeason > 0 && daysInSeason * season.costRate);
            },0);
        } 

        const allSeasons = [
                {startDate: new Date(2017,1-1,1),endDate: new Date(2017,4-1,30),costRate: 300},{startDate: new Date(2017,5-1,9-1,costRate: 400},10-1,12-1,31),costRate: 500}
            ],checkin = new Date(2017,checkout = new Date(checkin.getTime() + (48 * 60 * 60 * 1000)),totalPrice = getPrices(allSeasons,checkout);

        console.log(totalPrice);

解决方法

我很确定您可以用 daysInSeason * season.costRate 替换 daysInSeason * (season.costRate || VALUE)。如果 season.costRate 不存在，它将替换为 VALUE。

RobG 提出了一个很好的观点，我认为我的回答不正确。您想用 totalPrice + (daysInSeason>0? daysInSeason*season.costRate : fixedValue)

替换它