Question

这是我的JSON：

[
    {
        "id": "38",
        "article_id": "16",
        "news_event": "625",
        "language": "en",
        "channel_partner_id": "625",
        "title": "Test",
        "show_logo": null,
        "description": "test\n\n",
        "schedule": null,
        "event_date": "2012-03-09 10:08:35",
        "link_text": null,
        "guid": null,
        "timestamp": "2012-03-09 11:19:42",
        "website": null,
        "show_hours": null,
        "page_text": null
    },
    {
        "id": "37",
        "article_id": "15",
        "news_event": "625",
        "language": "en",
        "channel_partner_id": "625",
        "title": "Test",
        "show_logo": null,
        "description": "test\n\n",
        "schedule": null,
        "event_date": "2012-03-09 10:08:35",
        "link_text": null,
        "guid": null,
        "timestamp": "2012-03-09 11:19:39",
        "website": null,
        "show_hours": null,
        "page_text": null
    },
    {
        "id": "36",
        "article_id": "14",
        "news_event": "625",
        "language": "en",
        "channel_partner_id": "625",
        "title": "Test",
        "show_logo": null,
        "description": "test\n\n",
        "schedule": null,
        "event_date": "2012-03-09 10:08:35",
        "link_text": null,
        "guid": null,
        "timestamp": "2012-03-09 11:19:35",
        "website": null,
        "show_hours": null,
        "page_text": null
    },
    {
        "id": "35",
        "article_id": "13",
        "news_event": "625",
        "language": "en",
        "channel_partner_id": "625",
        "title": "Test",
        "show_logo": null,
        "description": "test\n\n",
        "schedule": null,
        "event_date": "2012-03-09 10:08:35",
        "link_text": null,
        "guid": null,
        "timestamp": "2012-03-09 11:19:31",
        "website": null,
        "show_hours": null,
        "page_text": null
    }
]

如何计算其中的对象数量？

Answer 1

这是一个阵列您可以解析它（JSON.parse），然后使用length属性。

Answer 2

您可以使用以下解决方案来计数JSON对象：

var jsonObject = {"test1":1,"test2":2};
var keyCount  = Object.keys(jsonObject).length;

Answer 3

var json = [{ "id": "38", "article_id": "16", "news_event": "625", "language": "en", "channel_partner_id": "625", "title": "Test", "show_logo": null, "description": "test\n\n", "schedule": null, "event_date": "2012-03-09 10:08:35", "link_text": null, "guid": null, "timestamp": "2012-03-09 11:19:42", "website": null, "show_hours": null, "page_text": null }, { "id": "37", "article_id": "15", "news_event": "625", "language": "en", "channel_partner_id": "625", "title": "Test", "show_logo": null, "description": "test\n\n", "schedule": null, "event_date": "2012-03-09 10:08:35", "link_text": null, "guid": null, "timestamp": "2012-03-09 11:19:39", "website": null, "show_hours": null, "page_text": null }, { "id": "36", "article_id": "14", "news_event": "625", "language": "en", "channel_partner_id": "625", "title": "Test", "show_logo": null, "description": "test\n\n", "schedule": null, "event_date": "2012-03-09 10:08:35", "link_text": null, "guid": null, "timestamp": "2012-03-09 11:19:35", "website": null, "show_hours": null, "page_text": null }, { "id": "35", "article_id": "13", "news_event": "625", "language": "en", "channel_partner_id": "625", "title": "Test", "show_logo": null, "description": "test\n\n", "schedule": null, "event_date": "2012-03-09 10:08:35", "link_text": null, "guid": null, "timestamp": "2012-03-09 11:19:31", "website": null, "show_hours": null, "page_text": null}]


//Object.keys(json).length --> USE

for (var i = 1, l = Object.keys(json).length; i <= l; i++) {

}

//by:Jorge Nones, Jales.

Answer 4

假设它在变量foo，foo.length。

中

var foo = [{...},{...},...];
alert(foo.length);
foo[0].id// 38;

Answer 5

您还可以使用在线JSON编辑器进行验证，例如，尝试JSON Editor Online by josdejong

Answer 6

此例程计算4个数组元素，每个元素有16个属性：

var obj = [{ "id": "38", "article_id": "16", "news_event": "625", "language": "en", "channel_partner_id": "625", "title": "Test", "show_logo": null, "description": "test\n\n", "schedule": null, "event_date": "2012-03-09 10:08:35", "link_text": null, "guid": null, "timestamp": "2012-03-09 11:19:42", "website": null, "show_hours": null, "page_text": null }, { "id": "37", "article_id": "15", "news_event": "625", "language": "en", "channel_partner_id": "625", "title": "Test", "show_logo": null, "description": "test\n\n", "schedule": null, "event_date": "2012-03-09 10:08:35", "link_text": null, "guid": null, "timestamp": "2012-03-09 11:19:39", "website": null, "show_hours": null, "page_text": null }, { "id": "36", "article_id": "14", "news_event": "625", "language": "en", "channel_partner_id": "625", "title": "Test", "show_logo": null, "description": "test\n\n", "schedule": null, "event_date": "2012-03-09 10:08:35", "link_text": null, "guid": null, "timestamp": "2012-03-09 11:19:35", "website": null, "show_hours": null, "page_text": null }, { "id": "35", "article_id": "13", "news_event": "625", "language": "en", "channel_partner_id": "625", "title": "Test", "show_logo": null, "description": "test\n\n", "schedule": null, "event_date": "2012-03-09 10:08:35", "link_text": null, "guid": null, "timestamp": "2012-03-09 11:19:31", "website": null, "show_hours": null, "page_text": null}]
for (var i = 0; i < obj.length; i++) {
  var ctr=0;
  for (attr in obj[i]) ctr++;
  alert('array['+i+']: ' +ctr);
}

Answer 7

const data = JSON.parse(this.response);

var length = 0;

for (var k in data) 
  if (data.hasOwnProperty(k)) 
     length++;

如何计算JSON对象

7 个答案: