将键值数组存储到紧凑的 JSON 字符串中

Question

我想存储一个键值项数组，一个常见的方法可能是这样的：

// the JSON data may store several data types, not just key value lists,
// but, must be able to identify some data as a key value list

// --> more "common" way to store a key value array
{
  [
    {"key": "slide0001.html", "value": "Looking Ahead"},
    {"key": "slide0008.html", "value": "Forecast"},
    {"key": "slide0021.html", "value": "Summary"},
    // another THOUSANDS KEY VALUE PAIRS
    // ...
  ],
  "otherdata" : { "one": "1", "two": "2", "three": "3" }
}

但是，当有很多对/项目时，字符串长度变得禁止， 我想要一个紧凑的方式，这可能是一个例子：

// --> (1) a "compact" way to store a key value array
{    
  [
      {"slide0001.html", "Looking Ahead"},
      {"slide0008.html", "Forecast"},
      {"slide0021.html", "Summary"},
      // another THOUSANDS KEY VALUE PAIRS
      // ...
  ],
  "otherdata" : { "one": "1", "two": "2", "three": "3" }
}

另外，我想要一种将数据标识为键值数组的方法， 因为，我可能想将其他数据存储在同一个 JSON 文件中。 我有这些例子：

// --> (2) a "compact" way to store a key value array    
{
    "keyvaluelist":
    [
      {"slide0001.html", "Looking Ahead"},
      {"slide0008.html", "Forecast"},
      {"slide0021.html", "Summary"},
      // another THOUSANDS KEY VALUE PAIRS
      // ...
    ],
    "otherdata" : { "one": "1", "two": "2", "three": "3" }
}

// --> (3) a "compact" way to store a key value array    
{
    "mylist":
    {
      "type": "keyvaluearray",
  "data":
    [
        {"slide0001.html", "Looking Ahead"},
        {"slide0008.html", "Forecast"},
        {"slide0021.html", "Summary"},
                    // another THOUSANDS KEY VALUE PAIRS
                    // ...
    ]
    },
    "otherdata" : { "one": "1", "two": "2", "three": "3" }
}

你有什么问题，你建议哪一个，你有其他方法吗？ 谢谢。

更新 1：删除无效代码。 Javascript => JSON

更新2：添加非键值数据

更新 3：将每个键值对中的“[”和“]”替换为“{”和“}”

Answer 1

那么为什么不简单地使用键值文字呢？

var params = {
    'slide0001.html': 'Looking Ahead',
    'slide0002.html': 'Forecase',
    ...
};

return params['slide0001.html']; // returns: Looking Ahead

Answer 2

如果解析此的逻辑知道{"key": "slide0001.html", "value": "Looking Ahead"} 是一个键/值对，那么您可以将其转换为一个数组并保存一些常量，指定哪个索引映射到哪个键。 p>

例如：

var data = ["slide0001.html", "Looking Ahead"];

var C_KEY = 0;
var C_VALUE = 1;

var value = data[C_VALUE];

所以，现在，您的数据可以是：

[
    ["slide0001.html", "Looking Ahead"],
    ["slide0008.html", "Forecast"],
    ["slide0021.html", "Summary"]
]

如果您的解析逻辑不提前知道数据的结构，您可以添加一些元数据来描述它。例如：

{ meta: { keys: [ "key", "value" ] },
  data: [
    ["slide0001.html", "Looking Ahead"],
    ["slide0008.html", "Forecast"],
    ["slide0021.html", "Summary"]
  ]
}

...然后由解析器处理。

Answer 3

对我来说，这是在 JSON 中构造此类数据的最“自然”方式，前提是所有键都是字符串。

{
    "keyvaluelist": {
        "slide0001.html": "Looking Ahead",
        "slide0008.html": "Forecast",
        "slide0021.html": "Summary"
    },
    "otherdata": {
        "one": "1",
        "two": "2",
        "three": "3"
    },
    "anotherthing": "thing1",
    "onelastthing": "thing2"
}

我把它读成

a JSON object with four elements
    element 1 is a map of key/value pairs named "keyvaluelist",
    element 2 is a map of key/value pairs named "otherdata",
    element 3 is a string named "anotherthing",
    element 4 is a string named "onelastthing"

第一个元素或第二个元素也可以被描述为对象本身，当然，每个元素都有三个元素。

Answer 4

要在 json 中使用键/值对，请使用对象而不使用数组

在数组中查找名称/值很困难，但在对象中查找很容易

例如：

var exObj = {
  "mainData": {
    "slide0001.html": "Looking Ahead",
    "slide0008.html": "Forecast",
    "slide0021.html": "Summary",
    // another THOUSANDS KEY VALUE PAIRS
    // ...
  },
  "otherdata" : { "one": "1", "two": "2", "three": "3" }
};
var mainData = exObj.mainData;
// for use:
Object.keys(mainData).forEach(function(n,i){
  var v = mainData[n];
  console.log('name' + i + ': ' + n + ', value' + i + ': ' + v);
});

// and string length is minimum
console.log(JSON.stringify(exObj));
console.log(JSON.stringify(exObj).length);