我怎样才能得到这个集合使用JavaScript的总数ID？

我有这个系列：https://graph.facebook.com/2playcz/albums 我怎样才能得到这个集合使用JavaScript的总数ID？

此集合包含8个id。我怎样才能得到这个集合使用JavaScript的总计数ID？（总= 8）

来源：

{ 
     "data": [ 
      { 
      "id": "201936779932071", 
      "from": { 
       "name": "2play.cz - Tenisov\u00e1 \u0161kola", 
       "category": "Sports league", 
       "id": "190320081093741" 
      }, 
      "name": "Tr\u00e9ninky", 
      "link": "https://www.facebook.com/album.php?fbid=201936779932071&id=190320081093741&aid=41883", 
      "cover_photo": "201937046598711", 
      "count": 8, 
      "type": "normal", 
      "created_time": "2012-07-02T09:33:43+0000", 
      "updated_time": "2012-09-15T12:05:44+0000", 
      "can_upload": false, 
      "likes": { 
       "data": [ 
        { 
         "id": "1788805921", 
         "name": "Edita Nov\u00e1" 
        }, 
        { 
         "id": "100001449904219", 
         "name": "Mirka Brani\u0161ov\u00e1" 
        } 
       ], 
       "paging": { 
        "next": "https://graph.facebook.com/201936779932071/likes?limit=25&offset=25&__after_id=100001449904219" 
       } 
      } 
      }, 
      { 
      "id": "205206429605106", 
      "from": { 
       "name": "2play.cz - Tenisov\u00e1 \u0161kola", 
       "category": "Sports league", 
       "id": "190320081093741" 
      }, 
      "name": "Turnaje a akce", 
      "link": "https://www.facebook.com/album.php?fbid=205206429605106&id=190320081093741&aid=42900", 
      "cover_photo": "205208716271544", 
      "count": 14, 
      "type": "normal", 
      "created_time": "2012-07-10T19:36:53+0000", 
      "updated_time": "2012-09-15T12:04:05+0000", 
      "can_upload": false 
      }, 
      { 
      "id": "221784994613916", 
      "from": { 
       "name": "2play.cz - Tenisov\u00e1 \u0161kola", 
       "category": "Sports league", 
       "id": "190320081093741" 
      }, 
      "name": "Tenisova \u0161kolka 2play", 
      "description": "Tenisov\u00e1 \u0161kolka 2play", 
      "link": "https://www.facebook.com/album.php?fbid=221784994613916&id=190320081093741&aid=49379", 
      "cover_photo": "221785024613913", 
      "count": 9, 
      "type": "normal", 
      "created_time": "2012-08-31T11:19:59+0000", 
      "updated_time": "2012-09-14T15:17:53+0000", 
      "can_upload": false 
      }, 
      { 
      "id": "203405996451816", 
      "from": { 
       "name": "2play.cz - Tenisov\u00e1 \u0161kola", 
       "category": "Sports league", 
       "id": "190320081093741" 
      }, 
      "name": "Webov\u00e9 fotografie - Logo", 
      "link": "https://www.facebook.com/album.php?fbid=203405996451816&id=190320081093741&aid=42285", 
      "cover_photo": "203406586451757", 
      "count": 11, 
      "type": "normal", 
      "created_time": "2012-07-05T10:12:40+0000", 
      "updated_time": "2012-09-14T15:16:40+0000", 
      "can_upload": false 
      }, 
      { 
      "id": "190332361092513", 
      "from": { 
       "name": "2play.cz - Tenisov\u00e1 \u0161kola", 
       "category": "Sports league", 
       "id": "190320081093741" 
      }, 
      "name": "Cover Photos", 
      "link": "https://www.facebook.com/album.php?fbid=190332361092513&id=190320081093741&aid=39232", 
      "cover_photo": "225939404198475", 
      "count": 2, 
      "type": "normal", 
      "created_time": "2012-06-09T13:52:38+0000", 
      "updated_time": "2012-09-12T18:15:51+0000", 
      "can_upload": false 
      }, 
      { 
      "id": "190802884378794", 
      "from": { 
       "name": "2play.cz - Tenisov\u00e1 \u0161kola", 
       "category": "Sports league", 
       "id": "190320081093741" 
      }, 
      "name": "Wall Photos", 
      "link": "https://www.facebook.com/album.php?fbid=190802884378794&id=190320081093741&aid=39324", 
      "cover_photo": "190802891045460", 
      "count": 2, 
      "type": "wall", 
      "created_time": "2012-06-10T13:19:48+0000", 
      "updated_time": "2012-07-17T17:16:19+0000", 
      "can_upload": false 
      }, 
      { 
      "id": "205207126271703", 
      "from": { 
       "name": "2play.cz - Tenisov\u00e1 \u0161kola", 
       "category": "Sports league", 
       "id": "190320081093741" 
      }, 
      "name": "Ostatn\u00ed", 
      "link": "https://www.facebook.com/album.php?fbid=205207126271703&id=190320081093741&aid=42902", 
      "cover_photo": "205209679604781", 
      "count": 4, 
      "type": "normal", 
      "created_time": "2012-07-10T19:40:05+0000", 
      "updated_time": "2012-07-16T14:47:16+0000", 
      "can_upload": false, 
      "likes": { 
       "data": [ 
        { 
         "id": "100001449904219", 
         "name": "Mirka Brani\u0161ov\u00e1" 
        } 
       ], 
       "paging": { 
        "next": "https://graph.facebook.com/205207126271703/likes?limit=25&offset=25&__after_id=100001449904219" 
       } 
      } 
      }, 
      { 
      "id": "190320914426991", 
      "from": { 
       "name": "2play.cz - Tenisov\u00e1 \u0161kola", 
       "category": "Sports league", 
       "id": "190320081093741" 
      }, 
      "name": "Profile Pictures", 
      "link": "https://www.facebook.com/album.php?fbid=190320914426991&id=190320081093741&aid=39224", 
      "cover_photo": "190327474426335", 
      "count": 1, 
      "type": "profile", 
      "created_time": "2012-06-09T13:29:16+0000", 
      "updated_time": "2012-06-09T13:43:08+0000", 
      "can_upload": false 
      }, 
      { 
      "id": "190322704426812", 
      "from": { 
       "name": "2play.cz - Tenisov\u00e1 \u0161kola", 
       "category": "Sports league", 
       "id": "190320081093741" 
      }, 
      "name": "Logo", 
      "description": "Loga spole\u010dnosti", 
      "link": "https://www.facebook.com/album.php?fbid=190322704426812&id=190320081093741&aid=39225", 
      "type": "normal", 
      "created_time": "2012-06-09T13:34:09+0000", 
      "updated_time": "2012-07-05T10:16:58+0000", 
      "can_upload": false 
      } 
     ] 
    }

来源

2012-09-23 JohnMalcom

如果你指的是data数组中的项目数，这纯粹是data.length。

来源

2012-09-23 18:22:46 jfriend00

首先，有 ID。如果要计算数组中元素的数量，则会有一个内置属性length。因此，如果您的对象名为x，则可以通过访问x.data.length来检索数据的长度。

在另一方面，如果你想算唯一ID的数量（ID应该由独特的，无论如何，但如果你真的真的想），你必须通过数组手动循环并计数：

var countIds = function (arr) { 
    var uniqueIds = {}, num = 0; 
    if (!arr.data) return false; 
    arr.data.forEach(function (val, i) { 
     if (typeof uniqueIds[val.id] === "undefined") { 
     ++num; 
     uniqueIds[val.id] = true; 
     } 
    }); 
    return num; 
};

来源

2012-09-23 18:46:03

我怎样才能得到这个集合使用JavaScript的总数ID？

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