如何在Javascript中没有任何键值的情况下从多维数组中获取数据？

Question

我有一个多维数组。我想要添加没有任何键值的Id。我想要一个关键值，如＆＃34; 566934ae-879a-58cb＆＃34;我该如何获得该ID？在javascript中。

var data = [{
        "7acafaa5-f276-9094": {
            "name": "kaa",
            "number": "46645",
            "city": "Surat",
            "hobby": "hockey",
            "birthdate": "2017-06-21"
        },
        "566934ae-879a-58cb": {
            "name": "Karrgi",
            "number": "096013",
            "city": "Ahmedabad",
            "hobby": "hockey",
            "birthdate": "2017-06-15"
        },
        "365867ca-9f09-367b": {
            "name": "Karnaargi",
            "number": "06013",
            "city": "Ahmedabad",
            "hobby": "hockey",
            "birthdate": "2017-06-15"
        }
    }
]

我必须从数组中获取所有id（键），这些ID都添加在一个表中

Answer 1

您可以使用Object.keys()，因为对象是一个数组使用索引来访问数组元素，那么可以使用该方法。

console.log(Object.keys(data[0]))

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var data = [{
  "7acafaa5-f276-9094": {
    "name": "kaa",
    "number": "46645",
    "city": "Surat",
    "hobby": "hockey",
    "birthdate": "2017-06-21"
  },
  "566934ae-879a-58cb": {
    "name": "Karnav B Pargi",
    "number": "09601096013",
    "city": "Ahmedabad",
    "hobby": "hockey",
    "birthdate": "2017-06-15"
  },
  "365867ca-9f09-367b": {
    "name": "Karnav B Pargi",
    "number": "09601096013",
    "city": "Ahmedabad",
    "hobby": "hockey",
    "birthdate": "2017-06-15"
  }
}];
console.log(Object.keys(data[0]))

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Answer 2

您可以使用缩减功能并收集密钥并创建地图，以便您可以使用这些密钥来获取该数据。

var data = [{
  "7acafaa5-f276-9094": {
    "name": "kaa",
    "number": "46645",
    "city": "Surat",
    "hobby": "hockey",
    "birthdate": "2017-06-21"
  },
  "566934ae-879a-58cb": {
    "name": "Karnav B Pargi",
    "number": "09601096013",
    "city": "Ahmedabad",
    "hobby": "hockey",
    "birthdate": "2017-06-15"
  },
  "365867ca-9f09-367b": {
    "name": "Karnav B Pargi",
    "number": "09601096013",
    "city": "Ahmedabad",
    "hobby": "hockey",
    "birthdate": "2017-06-15"
  }
}];

var idToProfileMap = data.reduce((acc, val) => {
  const keys = Object.keys(val);
  keys.forEach(k => {
    acc[k] = val[k];
  })
  return acc;
}, {});

// get all keys
const allIds = Object.keys(idToProfileMap);
console.log(Object.keys(idToProfileMap));

// get data using the first key
console.log(idToProfileMap[allIds[0]])

如果数据有多个元素，上面的代码也可以使用。

Answer 3

循环遍历data数组以获取特定的id数据，然后遍历id对象以获取它的属性

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    var data = [{
            "7acafaa5-f276-9094": {
                "name": "kaa",
                "number": "46645",
                "city": "Surat",
                "hobby": "hockey",
                "birthdate": "2017-06-21"
            },
            "566934ae-879a-58cb": {
                "name": "Karnav B Pargi",
                "number": "09601096013",
                "city": "Ahmedabad",
                "hobby": "hockey",
                "birthdate": "2017-06-15"
            },
            "365867ca-9f09-367b": {
                "name": "Karnav B Pargi",
                "number": "09601096013",
                "city": "Ahmedabad",
                "hobby": "hockey",
                "birthdate": "2017-06-15"
            }
        }
    ];
    
    data.forEach(function(id){
         // Get the data of particular id. You can loop over the specific id to access it's properties
         Object.keys(id).forEach(function(prop){
             console.log(id[prop]);
         })
    })

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