Question

我正在尝试用数组中的新对象替换一些现有对象，我有2个数组allDays和storedDay，两者将具有不同的大小allDays将有10个对象，storedDays将有4个对象但两者都具有相同的值day

mode(){
        this.nativeStorage.getItem("modifiedData").then((data)=>{
            console.log(data)
            var allDay = this.dailyDays;
            for (var i = 0; i < allDay.length; i++) {
                var element = allDay[i];
                var storedDay = data[i];
                console.log("all Day",element.day);
                console.log("stored Day",storedDay.day);
            if (element.day === storedDay.day) {
                    console.log("we have same day", i)  
                    data=({
                        day: data.day,
                        month: data.month,
                        year: data.year,
                        quantity: data.selectedQuantity,
                        brand: data.selectedBrand,
                        price: data.price,
                    })
                    // below line will replace the whole object
                    this.dailyDays[i] = data; 
                }

            }
            console.log(data.day)
        })
    }

在执行上述操作时我收到存储值错误，有人可以举例说明如何检查两个数组并使用storedDay更新数组。

此图像中的第一行是带有4个对象的storedDay数组。而allDay数组将有10个对象

Answer 1

您必须定义新变量以存储相同的日期值：

mode(){
    this.nativeStorage.getItem("modifiedData").then((data)=>{
        console.log(data);
        var sameDay = null; // =======> define this variable
        var allDay = this.dailyDays;
        for (var i = 0; i < allDay.length; i++) {
            var element = allDay[i];
            var storedDay = data[i];
            console.log("all Day",element.day);
            console.log("stored Day",storedDay.day);
        if (element.day === storedDay.day) {
                console.log("we have same day", i)  
                sameDay=({ // ==========> change this
                    day: data.day,
                    month: data.month,
                    year: data.year,
                    quantity: data.selectedQuantity,
                    brand: data.selectedBrand,
                    price: data.price,
                })
                // below line will replace the whole object
                this.dailyDays[i] = sameDay; // ======> change this
            }

        }
        if(sameDay)
            console.log(sameDay.day) // =======> and change this
    })
}

Answer 2

我设法找到了符合我要求的解决方案

mode(){
        this.nativeStorage.getItem("modifiedData").then((data)=>{
            console.log(data)
             var sameDay;
            var allDay = this.dailyDays;
            for (var i = 0; i < allDay.length; i++) {
                var allDayelement = allDay[i];

                console.log("all Day",allDayelement.day);

                data.forEach(forEachElement => {
                    console.log("forEachElement",forEachElement.day);
                    if (allDayelement.day === forEachElement.day) {
                    console.log("we have same day", i)  
                    sameDay=({
                        day: forEachElement.day,
                        month: forEachElement.month,
                        year: forEachElement.year,
                        quantity: forEachElement.selectedQuantity,
                        brand: forEachElement.selectedBrand,
                        price: forEachElement.price,
                    })
                    // below line will replace the whole object
                    this.dailyDays[i] = sameDay; 
            }
                });

            }
        //  console.log(data.day)
        })
    }

匹配数组中的两个值

2 个答案: