Question

我需要一些帮助，以便在nodejs的JSON数组的末尾添加一个新元素

示例JSON数组

[{
  "subject": "physics",
  "student_id": "2569",
  "values": "0.152,0.228,0.218"
}, {
  "subject": "maths",
  "student_id": "1236",
  "values": "0.146,0.22,0.212"
}, {
  "subject": "chemistry",
  "student_id": "4569",
  "values": "0.159,0.234,0.224"
}, {
  "subject": "physics",
  "student_id": "1478",
  "values": "0.16,0.235,0.225"
}]

预期结果应该是

[{
  "subject": "physics",
  "student_id": "2569",
  "values": "0.152,0.228,0.218"
}, {
  "subject": "maths",
  "student_id": "1236",
  "values": "0.146,0.22,0.212"
}, {
  "subject": "chemistry",
  "student_id": "4569",
  "values": "0.159,0.234,0.224"
}, {
  "subject": "physics",
  "student_id": "1478",
  "values": "0.16,0.235,0.225"
}, 
lastSyncTime: 1550467657366]

请为我提供一个简单的解决方案。

Answer 1

您只需使用javaScript

var myArray = [{
  "subject": "physics",
  "student_id": "2569",
  "values": "0.152,0.228,0.218"
}, {
  "subject": "maths",
  "student_id": "1236",
  "values": "0.146,0.22,0.212"
}, {
  "subject": "chemistry",
  "student_id": "4569",
  "values": "0.159,0.234,0.224"
}, {
  "subject": "physics",
  "student_id": "1478",
  "values": "0.16,0.235,0.225"
}];

myArray.push({lastSyncTime: 1550467657366});

console.log(myArray);

结果将是

[{
  "subject": "physics",
  "student_id": "2569",
  "values": "0.152,0.228,0.218"
}, {
  "subject": "maths",
  "student_id": "1236",
  "values": "0.146,0.22,0.212"
}, {
  "subject": "chemistry",
  "student_id": "4569",
  "values": "0.159,0.234,0.224"
}, {
  "subject": "physics",
  "student_id": "1478",
  "values": "0.16,0.235,0.225"
}, 
{lastSyncTime: 1550467657366}];

您也可以使用

获取最后一项

var lastSyncTime = myArray[myArray.length - 1].lastSyncTime;
console.log(lastSyncTime); // That is: 1550467657366

或者，如果您想使用lodash在列表中查找对象，请查看下面的链接

How to use lodash to find and return an object from Array?

如何在Node.js中的JSON数组末尾添加新元素

1 个答案: