Question

我正在尝试在JSON中添加一个新元素，但是我没有正确完成此操作。

我已经尝试了很多方法，不确定是怎么回事。

输入JSON

{
 "UnitID":"1148",
 "UNIT":"202B",
 "Speed":"29.0",
 "SpeedMeasureValue":"MPH",
 "Direction":"212",
 "LatitudeY":"42.0474150666667000",
 "LongitudeX":"-88.2750256000000000",
 "TimeStamp":"2019-04-25 15:19:45.0300000",
 "Status":"Enroute","StatusID":"13",
 "CallID":"841809",
 "ORI":"IL0450600"
}

连接后需要JSON输出

{
"UnitID":"1148",
"UNIT":"202B",
"Speed":"29.0",
"SpeedMeasureValue":"MPH",
"Direction":"212",
"LatitudeY":"42.0474150666667000",
"LongitudeX":"-88.2750256000000000",
"TimeStamp":"2019-04-25 15:19:45.0300000",
"Status":"Enroute","StatusID":"13",
"CallID":"841809","ORI":"IL0450600", 
"association": [
     {
       "event": "123",
       "label": "", 
       "relation": "321"}
       ]
}

代码-将objectToJson视为输入JSON的数组，并将obj作为前面提到的输入json

objectToJson.forEach((obj: any) => {
const association: any = `"association": [{"event": 123, "label": "", "relation": "321"}]`;
const concatenatedObject: object = Object.assign(obj, association);
const concatEventsJson: any = JSON.stringify(concatenatedObject);
console.log(concatEventsJson);
}

Answer 1

只需将association属性添加到对象-您需要通过以下方式将association设置为变量（而不是字符串）：

const association: any = [{"event": 123, "label": "", "relation": "321"}];
const concatenatedObject: object = { ...obj, association };

演示：

const objectToJson = [{"UnitID":"1148","UNIT":"202B","Speed":"29.0","SpeedMeasureValue":"MPH","Direction":"212","LatitudeY":"42.0474150666667000","LongitudeX":"-88.2750256000000000","TimeStamp":"2019-04-25 15:19:45.0300000","Status":"Enroute","StatusID":"13","CallID":"841809","ORI":"IL0450600"}];

objectToJson.forEach((obj) => {
  const association = [{"event": 123, "label": "", "relation": "321"}];
  const concatenatedObject = { ...obj, association };
  console.log(concatenatedObject);
});

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在JSON中添加新元素

1 个答案: