如何使用javascript在json文件中循环？

我的javascript代码中返回了一个json文件。该文件如下所示：

{
    "data": [
        {
            "id": "594984240522886",
            "from": {
                "id": "593959083958735",
                "category": "Community",
                "name": "Decoc"
            },
            "name": "Ducks",
            "description": "ducks",
            "link": "http://www.facebook.com/album.php?fbid=594984240522886&id=593959083958735&aid=1073741834",
            "cover_photo": "594984260522884",
            "count": 4,
            "type": "normal",
            "created_time": "2013-06-13T15:12:22+0000",
            "updated_time": "2013-06-13T15:12:40+0000",
            "can_upload": false
        },
        {
            "id": "593963787291598",
            "from": {
                "id": "593959083958735",
                "category": "Community",
                "name": "Decoc"
            },
            "name": "Profile Pictures",
            "link": "http://www.facebook.com/album.php?fbid=593963787291598&id=593959083958735&aid=1073741832",
            "cover_photo": "593963797291597",
            "count": 1,
            "type": "profile",
            "created_time": "2013-06-11T16:52:29+0000",
            "updated_time": "2013-06-11T16:52:31+0000",
            "can_upload": false
        },
        {
            "id": "593963467291630",
            "from": {
                "id": "593959083958735",
                "category": "Community",
                "name": "Decoc"
            },
            "name": "Goats",
            "description": "goats",
            "link": "http://www.facebook.com/album.php?fbid=593963467291630&id=593959083958735&aid=1073741831",
            "cover_photo": "593963477291629",
            "count": 7,
            "type": "normal",
            "created_time": "2013-06-11T16:51:56+0000",
            "updated_time": "2013-06-11T16:52:02+0000",
            "can_upload": false
        },
        {
            "id": "593962700625040",
            "from": {
                "id": "593959083958735",
                "category": "Community",
                "name": "Decoc"
            },
            "name": "Dogs",
            "description": "dogs",
            "link": "http://www.facebook.com/album.php?fbid=593962700625040&id=593959083958735&aid=1073741830",
            "cover_photo": "593962710625039",
            "count": 10,
            "type": "normal",
            "created_time": "2013-06-11T16:50:27+0000",
            "updated_time": "2013-06-11T16:50:37+0000",
            "can_upload": false
        },
        {
            "id": "593961937291783",
            "from": {
                "id": "593959083958735",
                "category": "Community",
                "name": "Decoc"
            },
            "name": "Cows",
            "description": "Cows",
            "link": "http://www.facebook.com/album.php?fbid=593961937291783&id=593959083958735&aid=1073741829",
            "cover_photo": "593961983958445",
            "count": 5,
            "type": "normal",
            "created_time": "2013-06-11T16:48:26+0000",
            "updated_time": "2013-06-11T16:49:32+0000",
            "can_upload": false
        }
    ],
    "paging": {
        "cursors": {
            "after": "NTkzOTYxOTM3MjkxNzgz",
            "before": "NTk0OTg0MjQwNTIyODg2"
        }
    }
}

---

我想在“数据”中循环，看看存在多少不同的数据元素（正如您看到的，每个元素都有一个id、from、name、description..）。如何使用javascript实现这一点？

您可以尝试以下代码：

for(i=0;json.data.length;i++){
    var element = json.data[i];
}

或者以另一种方式：

for (i in json.data) {
    if (json.data.hasOwnProperty(i)) {
        var element = json.data[i];
    }
}

---

查看“data”数组的

length

属性。主要的json对象名是什么？你可以使用for循环this:for（i=0；我非常感谢你mikez302。这确实是我所需要的。我正在考虑制作foreach循环，但是这个循环要干净100倍。谢谢你，Ani，这是从每个“数据”成员获取特定元素的下一步。为什么

if（json.Data.hasOwnProperty（i））呢

？您的

for

语句已经在

i

变量中分配了正确的值，因此您不必执行检查，它将始终为真。将

for…in

与数组一起使用通常是一种不好的做法。无法保证您将按数组顺序获取元素。

数组。但是，forEach

会e一个不错的选择。@DaFunix-

hasOwnProperty

用于过滤已被猴子修补到

数组中的任何内容。prototype

。例如，如果有一个垫片可添加

forEach

或

indexOf

方法。