Question

我正在使用纯javascript按降序排序对象数组。我最初认为JSON.stringify方法引起了问题，如[here] [1]所述。显然，JSON.stringify不会按设计保留对象的顺序。给出下面的对象数组我似乎得到一个随机排序顺序，使用下面的代码，我对对象数组进行排序，然后导出数组中第一个对象的权重属性。

var byWeight = objArray.slice(0);
var sorted = byWeight.sort(function(a,b) { return b.weight - a.weight; } );
sorted[0].something.weight;

在这段代码的不同运行中，我似乎随机得出.29或.35的权重。为什么会这样？

这是数组：

[
  {
    "something": {
      "terms": [
        {
          "elements": {
            "number": {
              "span": [
                9,
                10
              ],
              "value": "1"
            }
          },
          "span": [
            9,
            12
          ],
          "value": "1g",
          "label": "grams"
        }
      ],
      "span": [
        9,
        12
      ],
      "weight": 0.29,
      "value": "1gm"
    }
  },
  {
    "something": {
      "terms": [
        {
          "elements": {
            "number": {
              "span": [
                16,
                18
              ],
              "value": "30"
            }
          },
          "span": [
            16,
            20
          ],
          "value": "30ml",
          "label": "liters"
        }
      ],
      "span": [
        16,
        20
      ],
      "weight": 0.35,
      "value": "30ml"
    }
  }
]

Answer 1

你有错误的参考。改变这个

Content-length

to（watch var sorted = byWeight.sort(function(a,b) { return b.weight - a.weight; } );）

.something.

工作模式：

＆＃13;

byWeight.sort(function (a, b) { return b.something.weight - a.something.weight; });

＆＃13;

Answer 2

你的objArray格式不佳，＆＃34;术语＆＃34;如果它包含键索引元素，例如＆＃34; span＆＃34;，＆＃34; value＆＃34;，＆＃34; label＆＃39;它应该是一个对象;然后你的排序看错了，它应该是a.something.weight / b.something.weight。 jsfiddle.net/3qgtn9r1

var objArray = [
  {
    "something": {
      "terms": {
          "span": [
            9,
            12
          ],
          "value": "1g",
          "label": "grams"
      },
      "span": [
        9,
        12
      ],
      "weight": 0.29,
      "value": "1gm"
    }
  },
  {
    "something": {
      "terms": {
          "span": [
            16,
            20
          ],
          "value": "30ml",
          "label": "liters"
      },
      "span": [
        16,
        20
      ],
      "weight": 0.35,
      "value": "30ml"
    }
  }
];
var byWeight = objArray.slice(0);
var sorted = byWeight.sort(function(a,b) { return a.something.weight - b.something.weight; } );
console.log(sorted[0].something.weight);

javascript：排序对象数组导致不一致的结果

2 个答案: