Question

我正在努力弄清楚如何将我的数组键推送到我自己的数组中，我最终会将其用作列标题。

以下内容成功记录了我的密钥，但推送正在破坏

    let cols = []

    data.forEach(function (obj, index) {
      if (index === 0)
      {
        console.log(Object.keys(obj));
        this.cols.push(Object.keys(obj));
    }
    });

我实际上不必循环整个数据对象，我只需要第一个索引，但一次只需要一步！

我期望的最终结果是cols = [＆＃34; ValueDate＆＃34;，＆＃34; AccountName＆＃34;，＆＃34; Holding＆＃34;]

请有任何想法

Thnaks GWS

数据提取：

[
  {
    "ValueDate": "2017-04-26T14:16:00",
    "AccountName": "CASHAUD",
    "Holding": 318622.53
  },
  {
    "ValueDate": "2017-04-26T14:16:00",
    "AccountName": "CASHCAD",
    "Holding": 7195
  },
  {
    "ValueDate": "2017-04-26T14:16:00",
    "AccountName": "CASHEUR",
    "Holding": 5077.97
  },
  {
    "ValueDate": "2017-04-26T14:16:00",
    "AccountName": "CASHGBP",
    "Holding": 19625
  },
  {
    "ValueDate": "2017-04-26T14:16:00",
    "AccountName": "CASHJPY",
    "Holding": 16463
  },
  {
    "ValueDate": "2017-04-26T14:16:00",
    "AccountName": "CASHNZD",
    "Holding": 601.56
  },
  {
    "ValueDate": "2017-04-26T14:16:00",
    "AccountName": "CASHSGD",
    "Holding": 1000
  },
  {
    "ValueDate": "2017-04-26T14:16:00",
    "AccountName": "CASHUSD",
    "Holding": 1716906.25
  },
  {
    "ValueDate": "2017-04-27T14:16:00",
    "AccountName": "CASHAUD",
    "Holding": 318622.53
  },
  {
    "ValueDate": "2017-04-27T14:16:00",
    "AccountName": "CASHCAD",
    "Holding": 7195
  },
  {
    "ValueDate": "2017-04-27T14:16:00",
    "AccountName": "CASHEUR",
    "Holding": 5077.97
  },
  {
    "ValueDate": "2017-04-27T14:16:00",
    "AccountName": "CASHGBP",
    "Holding": 19625
  },
  {
    "ValueDate": "2017-04-27T14:16:00",
    "AccountName": "CASHJPY",
    "Holding": 16463
  },
  {
    "ValueDate": "2017-04-27T14:16:00",
    "AccountName": "CASHNZD",
    "Holding": 601.56
  },
  {
    "ValueDate": "2017-04-27T14:16:00",
    "AccountName": "CASHSGD",
    "Holding": 1000
  },
  {
    "ValueDate": "2017-04-27T14:16:00",
    "AccountName": "CASHUSD",
    "Holding": 1720781.25
  }
]

Answer 1

如果您只需要查看第一个索引，只需使用data = [ { "ValueDate": "2017-04-26T14:16:00", "AccountName": "CASHAUD", "Holding": 318622.53 }, { "ValueDate": "2017-04-26T14:16:00", "AccountName": "CASHCAD", "Holding": 7195 }, { "ValueDate": "2017-04-26T14:16:00", "AccountName": "CASHEUR", "Holding": 5077.97 }, { "ValueDate": "2017-04-26T14:16:00", "AccountName": "CASHGBP", "Holding": 19625 }, { "ValueDate": "2017-04-26T14:16:00", "AccountName": "CASHJPY", "Holding": 16463 }, { "ValueDate": "2017-04-26T14:16:00", "AccountName": "CASHNZD", "Holding": 601.56 }, { "ValueDate": "2017-04-26T14:16:00", "AccountName": "CASHSGD", "Holding": 1000 }, { "ValueDate": "2017-04-26T14:16:00", "AccountName": "CASHUSD", "Holding": 1716906.25 }, { "ValueDate": "2017-04-27T14:16:00", "AccountName": "CASHAUD", "Holding": 318622.53 }, { "ValueDate": "2017-04-27T14:16:00", "AccountName": "CASHCAD", "Holding": 7195 }, { "ValueDate": "2017-04-27T14:16:00", "AccountName": "CASHEUR", "Holding": 5077.97 }, { "ValueDate": "2017-04-27T14:16:00", "AccountName": "CASHGBP", "Holding": 19625 }, { "ValueDate": "2017-04-27T14:16:00", "AccountName": "CASHJPY", "Holding": 16463 }, { "ValueDate": "2017-04-27T14:16:00", "AccountName": "CASHNZD", "Holding": 601.56 }, { "ValueDate": "2017-04-27T14:16:00", "AccountName": "CASHSGD", "Holding": 1000 }, { "ValueDate": "2017-04-27T14:16:00", "AccountName": "CASHUSD", "Holding": 1720781.25 } ] let cols = Object.keys(data[0]) console.log(cols)即可。见下面的工作示例。

＆＃13;

adb shell settings get global multi_sim_voice_call

＆＃13;

Answer 2

使用

for(var key in obj){
}

data.forEach(function (obj, index) {
  if(index == 0){
    for(var key in obj){
       console.log(key);
    }
  }  
});

循环访问对象并获取键值

Answer 3

让cols = []

data.forEach(function (obj, index) {
  if (index === 0)
  {
    console.log(Object.keys(obj));
    cols.push(Object.keys(obj));
 }
});

的console.log（COLS）

将数组键推送到自己的数组

3 个答案: