javascript - 如何获取内部 JSON 的名称

Question

我正在从记录集上的数据库中获取一些信息，将其转换为 JSON 表示法。

但是现在，我不知道如何只阅读我的专栏名称。

看这个例子:

http://www.jsoneditoronline.org/?id=1bccb6d9522392f4763d58e24ff4a8e6

我需要读取 GND_AREA、DCR_AREA 名称。

编辑:

有些人在下面给出了一些可行的答案，但我认为我没有正确解释我想要的内容。

我的对象有一个名为“List”的键，因为该 JSON 具有以下结构:

我想检索字符串名称。不是值(value)观....

示例:我想要下面的那些字符串，因为这些字符串是我的列名，它们可以根据我搜索数据的表而改变。

GND_AREA、DCR_AREA、DCR_EQUIP 等......

P.S:这里真的是 javascript 的新手

结束编辑

---

我尝试了我在这里找到的所有可能性，但我不知道我的 JSON 符号是否正确....

我正在尝试使用 java 脚本执行此操作。

我试过的最后一个是这个:

Object.keys(obj).forEach(function (key) {
               console.log (obj[key].name)
            });

这是我的字符串:

{
  "List": [
    {
      "GND_AREA": "Redução",
      "DCR_AREA": "Alto Forno 1",
      "DCR_EQUIP": "AF1-Conjunto de Sopro 01 a 28",
      "DCR_TECNCA": "Monitoramento",
      "DCR_DCPLNA": "Temperatura",
      "COD_POSIC": "61019",
      "DCR_POSIC": "OB-F1-RE-ANVE-CJSO-01A05",
      "DCR_POSFUN": "Conjunto de Sopro 01-05 do Anel de Vento do Alto Forno 1",
      "DCR_PNTINS": "Algaraviz 1",
      "DAT_INSP": "23/2/2016 21:28:48",
      "VLR_DP_DESVIO": "",
      "VLR_LTURA": "450",
      "VLR_DMA_DESVIO": "350",
      "COD_UNDMED": "°C "
    },
    {
      "GND_AREA": "Redução",
      "DCR_AREA": "Alto Forno 1",
      "DCR_EQUIP": "AF1-Conjunto de Sopro 01 a 28",
      "DCR_TECNCA": "Monitoramento",
      "DCR_DCPLNA": "Temperatura",
      "COD_POSIC": "61019",
      "DCR_POSIC": "OB-F1-RE-ANVE-CJSO-01A05",
      "DCR_POSFUN": "Conjunto de Sopro 01-05 do Anel de Vento do Alto Forno 1",
      "DCR_PNTINS": "Algaraviz 1",
      "DAT_INSP": "24/2/2016 21:37:49",
      "VLR_DP_DESVIO": "",
      "VLR_LTURA": "140",
      "VLR_DMA_DESVIO": "350",
      "COD_UNDMED": "°C "
    }
  ]
}

Answer 1

这可能有助于解释。将这些函数放在您的代码中并调用 init() 它将在控制台中显示您的 JSON 的属性。

function display(obj, lvl) {
    var tab = Array(lvl + 1).join("\t");
    for (var property in obj) {
        var type = typeof obj[property];
        if (obj.hasOwnProperty(property)) {
            console.log(tab+"'"+property + "' of type "+type+" and value: "+obj[property]);
        }
        if (type == 'object') {
            console.log(tab+"which has the following properties:");
            display(obj[property], lvl + 1);
        }
    }
}
function init() {
    var json = '{"List":[{"GND_AREA": "Redução","DCR_AREA": "Alto Forno 1","DCR_EQUIP": "AF1-Conjunto de Sopro 01 a 28","DCR_TECNCA": "Monitoramento","DCR_DCPLNA": "Temperatura","COD_POSIC": "61019","DCR_POSIC": "OB-F1-RE-ANVE-CJSO-01A05","DCR_POSFUN": "Conjunto de Sopro 01-05 do Anel de Vento do Alto Forno 1","DCR_PNTINS": "Algaraviz 1","DAT_INSP": "23/2/2016 21:28:48","VLR_DP_DESVIO": "","VLR_LTURA": "450","VLR_DMA_DESVIO": "350","COD_UNDMED": "°C "},{"GND_AREA": "Redução","DCR_AREA": "Alto Forno 1","DCR_EQUIP": "AF1-Conjunto de Sopro 01 a 28","DCR_TECNCA": "Monitoramento","DCR_DCPLNA": "Temperatura","COD_POSIC": "61019","DCR_POSIC": "OB-F1-RE-ANVE-CJSO-01A05","DCR_POSFUN": "Conjunto de Sopro 01-05 do Anel de Vento do Alto Forno 1","DCR_PNTINS": "Algaraviz 1","DAT_INSP": "24/2/2016 21:37:49","VLR_DP_DESVIO": "","VLR_LTURA": "140","VLR_DMA_DESVIO": "350","COD_UNDMED": "°C "}]}';
    var obj = JSON.parse(json);
    console.log("My JSON has properties named:");
    display(obj, 1);
}

附言obj.property 是 obj['property']

的语法糖