从 json“提要”获取时间序列答案

【问题标题】：Getting a time series from a json "feed"从 json“提要”获取时间序列
【发布时间】：2016-11-30 08:30:09
【问题描述】：

虽然 ThingSpeak 有出色的图表，但我想从 ThingSpeak 获取数据并使用 Google Charts 制作自己的图表。从 ThingSpeak 获取“提要”时，“提要”是一个 JSON 对象，如下所示：

{
  "channel":
  {
     "id": 9,
     "name": "my_house",
     "description": "Netduino Plus connected to sensors around the house",
     "latitude": "40.44",
     "longitude": "-79.996",
     "field1": "Light",
     "field2": "Outside Temperature",
     "created_at": "2010-12-13T20:20:06-05:00",
     "updated_at": "2014-02-26T12:43:04-05:00",
     "last_entry_id": 6060625
  },
  "feeds":
       [
          {
            "created_at": "2014-02-26T12:42:49-05:00",
            "entry_id": 6060624,
            "field1": "188",
            "field2": "25.902335456475583"
          },
          {
            "created_at": "2014-02-26T12:43:04-05:00",
            "entry_id": 6060625,
            "field1": "164",
            "field2": "25.222929936305732"
          }
      ]
  }

我花了相当长的时间寻找将“created_at”和“field1”（可能还有“field2”）数据提取到表/数组中的方法，但我无法弄清楚。我的目标是这样的：

[
['created_at',                'field1', 'field2'],
['2014-02-26T12:42:49-05:00', 188,      25.902335456475583],
['2014-02-26T12:43:04-05:00', 164,      25.222929936305732]
]

我该怎么做？

【问题讨论】：

标签： javascript arrays json

【解决方案1】：

我会这样做。（注意：我使用此处的代码来确定如何获取标题：How to iterate through property names of Javascript object?）

var j = {
  "channel":
  {
     "id": 9,
     "name": "my_house",
     "description": "Netduino Plus connected to sensors around the house",
     "latitude": "40.44",
     "longitude": "-79.996",
     "field1": "Light",
     "field2": "Outside Temperature",
     "created_at": "2010-12-13T20:20:06-05:00",
     "updated_at": "2014-02-26T12:43:04-05:00",
     "last_entry_id": 6060625
  },
  "feeds":
       [
          {
            "created_at": "2014-02-26T12:42:49-05:00",
            "entry_id": 6060624,
            "field1": "188",
            "field2": "25.902335456475583"
          },
          {
            "created_at": "2014-02-26T12:43:04-05:00",
            "entry_id": 6060625,
            "field1": "164",
            "field2": "25.222929936305732"
          }
      ]
  }

var results = [];
var feeds = j.feeds;

var headers = [];
for (var key in feeds[0]) {
    headers.push(key);
}
results.push(headers);

for (var x = 0; x < feeds.length; x++) {
    var row = [];
    var feed = feeds[x];
    for (var y = 0; y < headers.length; y++) {
        var header = headers[y];
        row.push(feed[header]);
    }
    results.push(row);
}

console.log(results);

&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"&gt;&lt;/script&gt;

【讨论】：