JavaScript - 按嵌套值对 JSON 对象进行排序

Question

总结:有一个多层次的亲子评论系统，即

示例:

comment 1
    comment 1-1
        comment 1-1-1
    comment 1-2
        comment 1-2-1
             comment 1-2-2

这里，comment 1 是父级，comment 1-1 & comment 1-2 都是 comment 1 的子项，依此类推。

要求:

我们希望根据属性值实现对整个对象的排序。即时间戳(最新的评论或回复会出现在最上面)。

JSON 对象:

{
  "CommentText": "",
  "CommentCreateStamp": "2016-03-22",
  "Comments": [{
    "CommentText": "comment 1",
    "CommentCreateStamp": "2016-03-09",
    "Comments": [{
      "CommentText": "comment 1-1",
      "CommentCreateStamp": "2016-03-15",
      "Comments": [{
        "CommentText": "comment 1-1-1",
        "CommentCreateStamp": "2016-03-21",
        "Comments": null
      }]
    }]
  }],
  "Comments": [{
    "CommentText": "comment 2",
    "CommentCreateStamp": "2016-03-12",
    "Comments": [{
      "CommentText": "comment 2-1",
      "CommentCreateStamp": "2016-03-10",
      "Comments": [{
        "CommentText": "comment 2-1-1",
        "CommentCreateStamp": "2016-03-14",
        "Comments": null
      }]
    }]
  }]
}

到目前为止我试过了:

JSfiddle:https://jsfiddle.net/asceeevb/

我在 Stack Overflow 上看到很多问题，但没有按要求工作。

Answer 1

我不完全确定你在问什么，但你的代码有几处似乎有问题:

• 您重新定义了对象的 comments 属性，也许您想要一个数组？
• 您的排序函数应该根据元素的比较返回一个值，而不是输出它。参见 this SO question用于日期比较。

---

更新:您很接近，您缺少的是对嵌套评论的 sorting 的调用。下面是递归调用 sorting 的片段:

var people = {
  "CommentText": "",
  "CommentCreateStamp": "",
  "Comments": [{
    "CommentText": "c1",
    "CommentCreateStamp": "2016-03-23 06:05:36",
    "Comments": [{
      "CommentText": "c2",
      "CommentCreateStamp": "2016-03-23 06:05:59",
    }],
  }, {
    "CommentText": "a1",
    "CommentCreateStamp": "2017-03-23 06:05:45",
    "Comments": [{
      "CommentText": "a2",
      "CommentCreateStamp": "2016-03-23 06:06:05",
    }, {
      "CommentText": "a3",
      "CommentCreateStamp": "2016-03-23 06:06:16",
    }, {
      "CommentText": "a4",
      "CommentCreateStamp": "2016-03-23 06:06:23",
    }],
  }],
};



function sorting(js_object, key_to_sort_by) {

  function sortByKey(a, b) {
    var x = a[key_to_sort_by];
    var y = b[key_to_sort_by];
    return ((x < y) ? 1 : ((x > y) ? -1 : 0));
  };

  js_object.sort(sortByKey);

};

function sortComments(comments) {
  
  sorting(comments, 'CommentCreateStamp');
  for (var i = 0; i < comments.length; i++)
    if (comments[i].hasOwnProperty('Comments'))
      sortComments(comments[i].Comments);

};

sortComments(people.Comments);
console.log(people.Comments);