循环访问JSON并添加新的键值数据

Question

我有一个像这样的大型json数据集：

{
   "10001": {
       "coords": [
           "40.753793,-74.007026/40.750272,-74.00828",
           "40.751445,-74.00143/40.752055,-74.000975",
           "40.751439,-73.99768/40.752723,-73.99679"
       ],
       "meta": {
           "city": "New York",
           "state": "NY",
           "latCenter": 40.71,
           "lngCenter": -73.99
       }
   },
   "10002": {
       "coords": [
           "40.714069,-73.997504/40.709181,-73.996222/40.709485,-73.994022"
       ],
       "meta": {
           "city": "New York",
           "state": "NY",
           "latCenter": 40.71,
           "lngCenter": -73.99
       }
   },
   and so on....
}

我需要在"key" : "value"类别中添加新的"meta"数据。我尝试使用JSON.parse将其转换为JavaScript对象，但它不起作用。它说JSON格式不正确。甚至在转换之后，如何通过循环实际访问元部分并在那里添加新值，保留旧的格式和数据？

Answer 1

const data = {
   "10001": {
       "coords": [
           "40.753793,-74.007026/40.750272,-74.00828",
           "40.751445,-74.00143/40.752055,-74.000975",
           "40.751439,-73.99768/40.752723,-73.99679"
       ],
       "meta": {
           "city": "New York",
           "state": "NY",
           "latCenter": 40.71,
           "lngCenter": -73.99
       }
   },
   "10002": {
       "coords": [
           "40.714069,-73.997504/40.709181,-73.996222/40.709485,-73.994022"
       ],
       "meta": {
           "city": "New York",
           "state": "NY",
           "latCenter": 40.71,
           "lngCenter": -73.99
       }
   }
};

// inject key "hello" with value "world"
Object.keys(data).forEach(key => Object.assign(data[key].meta, { "hello": "world" }));

console.log(data);

Answer 2

您应该使用Object.keys(object)方法：

var obj={
   "10001": {
       "coords": [
           "40.753793,-74.007026/40.750272,-74.00828",
           "40.751445,-74.00143/40.752055,-74.000975",
           "40.751439,-73.99768/40.752723,-73.99679"
       ],
       "meta": {
           "city": "New York",
           "state": "NY",
           "latCenter": 40.71,
           "lngCenter": -73.99
       }
   },
   "10002": {
       "coords": [
           "40.714069,-73.997504/40.709181,-73.996222/40.709485,-73.994022"
       ],
       "meta": {
           "city": "New York",
           "state": "NY",
           "latCenter": 40.71,
           "lngCenter": -73.99
       }
   }
}

var keys=Object.keys(obj);
for(i=0;i<keys.length;i++){
  obj[keys[i]]["meta"]["key"]=0;
}
console.log(obj);