如何使用JavaScript合并不同的JSON对象？

如何使用JavaScript合并这些JSON对象

如果缺少一个键，则将null放在值的位置

转换自：

[{"dateData": "2019-04-08", "geriatricDepressionScaleTotalScoreData": "5"}, 
{"dateData": "2019-04-09", "geriatricDepressionScaleTotalScoreData": "2"}]

[{"dateData": "2019-04-08", "digitSpanTotalScoreData": "10"},
{"dateData": "2019-04-09", "digitSpanTotalScoreData": "12"}]

[{"dateData": "2019-04-09", "immediateRecallStoryAData": "4", 
"delayedRecallStoryAData": "6"}]

[{"dateData": "2019-04-08", "phonologicalTotalData": "30"},
{"dateData": "2019-04-09", "phonologicalTotalData": "4"}]

转换为：

[{"dateData": "2019-04-08", "geriatricDepressionScaleTotalScoreData": "5",
"digitSpanTotalScoreData": "10", "immediateRecallStoryAData": null,
"delayedRecallStoryAData": null, "phonologicalTotalData": "30"}, 
{"dateData": "2019-04-09", "geriatricDepressionScaleTotalScoreData": "2",
"digitSpanTotalScoreData": "12", "immediateRecallStoryAData": 4,
"delayedRecallStoryAData": 6, "phonologicalTotalData": "4"}]

---

您可以使用像这样的扩展运算符来执行此操作

var myArr = [{ "dateData": "2019-04-08", "geriatricDepressionScaleTotalScoreData": "5" }, { "dateData": "2019-04-09", "geriatricDepressionScaleTotalScoreData": "2" }];
    myArr.push(...[{ "dateData": "2019-04-08", "digitSpanTotalScoreData": "10" }, { "dateData": "2019-04-09", "digitSpanTotalScoreData": "12" }]);
    myArr.push(...[{ "dateData": "2019-04-09", "immediateRecallStoryAData": "4", "delayedRecallStoryAData": "6" }]);
    myArr.push(...[{ "dateData": "2019-04-08", "phonologicalTotalData": "30" }, { "dateData": "2019-04-09", "phonologicalTotalData": "4" }]);

    var final = JSON.stringify(myArr);
    console.log(final);

---

可以使用Array

.map（）

函数将现有对象数组重新格式化为具有新重新格式化对象的新数组

const arr = [{"dateData": "2019-04-08", "geriatricDepressionScaleTotalScoreData": "5"},
             {"dateData": "2019-04-09", "geriatricDepressionScaleTotalScoreData": "2"}];

const result = arr.map((el) => {
    const obj = {};
   obj['dateData'] = el.hasOwnProperty('dateData')?el['dateData'] :null;
   obj['geriatricDepressionScaleTotalScoreData'] = el.hasOwnProperty('geriatricDepressionScaleTotalScoreData')?el['geriatricDepressionScaleTotalScoreData'] :null;
   obj['digitSpanTotalScoreData'] = el.hasOwnProperty('digitSpanTotalScoreData')?el['digitSpanTotalScoreData'] :null;
   obj['immediateRecallStoryAData'] = el.hasOwnProperty('immediateRecallStoryAData')?el['immediateRecallStoryAData'] :null;
   obj['delayedRecallStoryAData'] = el.hasOwnProperty('delayedRecallStoryAData')?el['delayedRecallStoryAData'] :null;
   obj['phonologicalTotalData'] = el.hasOwnProperty('phonologicalTotalData')?el['phonologicalTotalData'] :null;

  return obj;
});

---

您可以使用Object.assign（…您的数组）您需要更具体地说明所需内容。为什么

老年抑郁症量表TotalScore Data

获得值

5

，而不是

2

？还有，你试过什么？因为它的格式很难理解。有两个单独的日期获取老年抑郁症量表TotalScore数据。