javascript-是否可以定义包含对象的对象？

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？

解决方法:

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(请参见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);
}

选中此code here(单击运行以查看结果)