javascript - 如何将数组值放入嵌套数组中

Question

var collection = {
    "2548": {
      "album": "Slippery When Wet",
      "artist": "Bon Jovi",
      tracks: [ 
        "Let It Rock", 
        "You Give Love a Bad Name" 
      ]
    },
    "2468": {
      "album": "1999",
      "artist": "Prince",
      "tracks": [ 
        "1999", 
        "Little Red Corvette" 
      ]
    },
    "1245": {
      "artist": "Robert Palmer",
      "tracks": [ ]
    },
    "5439": {
      "album": "ABBA Gold"
    }
};

var collectionCopy = JSON.parse(JSON.stringify(collection));

function updateRecords(id, prop, value) {  
  if (!value) delete collection[id][prop];
  if (!!value && prop === 'tracks'){

   collection[id][prop] = []; // Solve my problem

    collection[id][prop].push(value);
  } 
  if (!!value && prop === 'artist') collection[id][prop] = value;
  return collection;
}

updateRecords(5439, "tracks", "Take a Chance on Me");

这是返回错误的原始代码。这是经过编辑的，请忽略这个问题，谢谢。尝试修复“push 是未定义函数”的错误。如果未定义，则无法将值推送到数组对象上，因此我将

集合[id][prop] = [];//解决我的问题

避免出现错误，提示此行代码中未定义推送....

集合[id][prop].push(value);

Answer 1

尝试以下

collection["5439"].tracks = ["some info", "some more info"];