Question

我有这个JSON对象：

var collection = {
    "123":{
      "name": "Some Name",
      "someArray": [
          "value 0",
          "value 1"
       ]
     },
    "124":{
      "name": "Some Name"
     },

我有一个更新和返回集合的方法，例如：

function updateCollection(id, property, value){
return collection;
}

假设方法调用是这样的：

updateCollection(124, someArray, "value 3");

我应该如何更新？我已经写的是：

function updateCollection(id, property, value){
  if(collection[id].hasOwnProperty(property)){
    collection[id][property].push(value);
  }
  else{
   //need help here 
  }
  return collection;
}

Answer 1

仅使用value创建一个新数组，并将其分配给collection[id][property]：

function updateCollection(id, property, value) {
  collection[id] = collection[id] || {}; // if "id" doesn't exist in collection
   if (collection[id].hasOwnProperty(property) {
      collection[id][property].push(value);
    } else {
      collection[id][property] = [value]
    }
    return collection;
  }

Answer 2

我会向前迈一步，为不存在的任何id插入一个新对象，并在必要时为property创建一个新数组。

function updateCollection(id, property, value) {
    collection[id] = collection[id] || {};
    collection[id][property] = collection[id][property] || [];
    collection[id][property].push(value);
    return collection;
}

Answer 3

这里是您的代码。

var collection = {
"123":{
  "name": "Some Name",
  "someArray": [
      "value 0",
      "value 1"
   ]
 },
"124":{
  "name": "Some Name"
 }
 };

 function updateCollection(id, property, value){
  var _coll = collection.hasOwnProperty(id) ? collection[id] : {};
  _coll[property] = value;
  collection[id] = _coll;
  return collection;
 }

 console.log(updateCollection(124, "somearray", ['1','2']));

Answer 4

我已经更新了您的代码，它对于不存在数组或值的情况应该会更好

var collection = {
    "123":{
      "name": "Some Name",
      "someArray": [
          "value 0",
          "value 1"
       ]
     },
    "124":{
      "name": "Some Name"
     }};
function updateCollection(id, property, value) {
  if (collection[id] && collection[id][property]) {
      collection[id][property].push(value);
    }
    else
    {
    collection[id] = {};
      collection[id][property] = [value]
    }
  return collection;  
  }



  updateCollection(124, "someArray", "value 3");
  updateCollection(125, "someArray", "value 3");
  console.log(collection);

将数组添加到JSON对象（如果不存在）

4 个答案: