javascript - 如何在 Javascript 的键中按日期对对象进行排序

Question

我有以下对象:

var obj = { 2017-05-28: 76.16108625212159, 2017-02-12: 70.32183347555772, 2017-05-21: 74.21070693205216, 2017-04-23: 78.49819059107358, 2017-03-05: 73.36286201022146, 2017-04-02: 79.07588060050237, 2017-01-29: 79.07021235890568, 2017-03-26: 74.79360018220122, 2017-01-22: 71.80166785183269, 2017-04-09: 72.68569443640364 };

我想按日期排序，从一月开始，但我不知道该怎么做。

你怎么看，用JS可以吗？

提前致谢

Answer 1

键的顺序在一个对象中是不保证的。您可以将您的数据结构转换为排序数组，如下所示，并根据您的需要遍历该数组:

var obj = {
  "2017-05-28": 76.16108625212159,
  "2017-02-12": 70.32183347555772,
  "2017-05-21": 74.21070693205216,
  "2017-04-23": 78.49819059107358,
  "2017-03-05": 73.36286201022146,
  "2017-04-02": 79.07588060050237,
  "2017-01-29": 79.07021235890568,
  "2017-03-26": 74.79360018220122,
  "2017-01-22": 71.80166785183269,
  "2017-04-09": 72.68569443640364
};

var sortedArray = Object.keys(obj).sort().map(function(key) {
  return {
    date: key,
    value: obj[key]
  }
});

console.log(sortedArray);
/**Outputs:
[
  {
    "date": "2017-01-22",
    "value": 71.80166785183269
  },
  {
    "date": "2017-01-29",
    "value": 79.07021235890568
  },
  {
    "date": "2017-02-12",
    "value": 70.32183347555772
  },
  {
    "date": "2017-03-05",
    "value": 73.36286201022146
  },
  {
    "date": "2017-03-26",
    "value": 74.79360018220122
  },
  {
    "date": "2017-04-02",
    "value": 79.07588060050237
  },
  {
    "date": "2017-04-09",
    "value": 72.68569443640364
  },
  {
    "date": "2017-04-23",
    "value": 78.49819059107358
  },
  {
    "date": "2017-05-21",
    "value": 74.21070693205216
  },
  {
    "date": "2017-05-28",
    "value": 76.16108625212159
  }
]
**/