javascript - 是否可以定义一个包含对象的对象？

Question

我有这个对象:

var a = {
 "1":{"topicId":1,
      "subTopicId":1,
      "topicName":"x",
      "subTopicName":"x"},
 "2":{"topicId":1,
      "subTopicId":2,
      "topicName":"x",
      "subTopicName":"x"},
 "62":{"topicId":10,
       "subTopicId":62,
       "topicName":"x",
       "subTopicName":"x"}
}

我意识到我可以像这样定义内部对象:

interface IData {
    topicId: number;
    subTopicId: number;
    topicName: string;
    subTopicName; string;
}

但是有没有一种方法可以定义可以具有任意数量的 IData 对象的整个对象？

Answer 1

如果 JSON 包含“stringId”(例如“1”、“2”)作为标识符，我们可以将该对象定义为字典(参见 here ) :

interface IData 
{
    topicId: number;
    subTopicId: number;
    topicName: string;
    subTopicName; string;
}
// IDictionary with a key of type string
//              and a value of type IData
interface IDataSet
{
    [key: string] : IData;
} 

var source = 
'{  "1":{"topicId":1, "subTopicId":1, "topicName":"x","subTopicName":"x"},'+
'   "2":{"topicId":1, "subTopicId":2, "topicName":"x","subTopicName":"x"},'+
'  "62":{"topicId":10,"subTopicId":62,"topicName":"x","subTopicName":"x"}'+
'}';

var a = <IDataSet>JSON.parse(source);

for(var key in a)
{
    var elm = document.createElement('div');
    elm.innerText = "key: " + key + ", topicId: " + a[key].topicId  
    document.body.appendChild(elm);
}

检查这个code here(点击运行，查看结果)