数组的索引值

问题描述:

我有一个json文件,其内容如下:

I have a json file with contents like this:

{
     "aaa":{
         "status":"available",
         "classkey":"dotnet"
     },
     "bbb":{
         "ccc":{
             "com":"available",
             "net":"available",
             "info":"available",
             "org":"available"
          }
     }
}

现在,我想按索引获取数组的值(例如,像xxx[0]这样的xxx[0]而不是xxx['aaa']).我怎么做?

Now I want to fetch the value of array by index (ex., xxx[0] like this not like xxx['aaa']). How do I do that?

您不能.不能保证json和大多数其他键值数据结构中的顺序.此外,您没有数组,但是有一个对象.如果不打算使用名称访问值,为什么要完全使用名称/值对?其中存在json和其他键值数据存储的功能.如果需要通过整数索引访问值,则只需使用数组来存储数据.

You can't. Order is not guaranteed in json and most other key-value data structures. Furthermore you don't have an array, you have an object. Why use name-value pairs at all if you aren't going to use the names to access the values? Therein lies the power of json and other key-value data stores. If you need to access the values by integer indexes, then just use an array to store your data.