javascript - 当从 `for` 循环内的 while 循环将值插入数组时，它会覆盖数组中的先前元素

Question

When I push values into an array from a while loop inside that's for loop it overwrites the previous elements inside the array.

        var startDate = new Date(theoreticalData[0].UpdateDateMDY);
        var newDate = startDate;
        var daysDif = 0;
        var daysArray = [startDate];
        for ( var i= 1; i<theoreticalData.length; i++ ) {                
            var OldCycle = parseInt(theoreticalData[i].OldCycle);
            daysDif = theoreticalData[i].DaysDifference;
            while (daysDif > OldCycle ) {
                nextDate = this.sumDays(nextDate , OldCycle);
                daysArray.push(nextDate);
                daysDif = daysDif - OldCycle;
            } 
            nextDate = this.sumDays(nextDate , daysDif);
            daysArray.push(nextDate);
        }

Answer 1

When I push values inside a while loop inside a for loop it overwrites the previous elements inside the array.

因为您每次都更新相同的对象并将其推送到数组，

更改此行

nextDate = this.sumDays(nextDate , OldCycle);

至

nextDate = new Date(this.sumDays(nextDate , OldCycle).getTime());

这将每次创建一个新的Date对象。