[英]Node.js loop through nested Javascript object
我希望有來自Facebook的帖子+附件,以便創建帖子列表。 問題是我想為每個帖子提要將屬性:id,消息和任何附件放入數組中。 我不確定是否需要遍歷數組中的對象,還是可以選擇ID並獲取相關信息。
另外,我正在使用async.waterfall()來獲取同步調用,因為我將進行依賴於先前調用的其他調用。
我試圖這樣做以獲得附件的ID,消息和src url:
var async = require("async");
var graph = require('fbgraph');
async.waterfall([
getFeed,
getPostPicture,
], function (err, result) {
});
function getFeed(callback) {
graph.get("/.../feed" + "?fields=message,attachments&access_token=APPID|APPSECRET", function(err, res) {
callback(null, res);
});
}
function getPostPicture(arg1, callback) {
var feedData = arg1.data;
for(var i in feedData)
{
var id = feedData[i].id;
var message = feedData[i].message;
var feedAttachment = feedData[i].attachments
for (var j in feedAttachment)
{
var attachment = feedAttachment.data;
var attachmentURL = attachment[i].src;
for (var j in attachmentURL)
{
var attachmentURL = feedAttachment.src;
}
}
}
console.log(attachment);
}
以上將輸出:
[ { description: 'post message 1',
media: { image: [Object] },
target:
{ id: '...',
url: 'https://www.facebook.com/.../photos/a............/.../?type=3' },
title: 'Timeline Photos',
type: 'photo',
url: 'https://www.facebook.com/.../photos/a............/.../?type=3' } ]
以下是我首先在源代碼中調用graph.get的響應
而且我需要{數據-> [消息,ID,附件->數據[src]]}
{
"data": [
{
"message": "post message 1",
"id": "..._...",
"attachments": {
"data": [
{
"description": "picture 1",
"media": {
"image": {
"height": 256,
"src": "https://scontent.xx.fbcdn.net/v/t1.0-9/..._..._..._n.png?oh=...&oe=...",
"width": 256
}
},
"target": {
"id": "...",
"url": "https://www.facebook.com/.../photos/a............/.../?type=3"
},
"title": "Timeline Photos",
"type": "photo",
"url": "https://www.facebook.com/.../photos/a............./..../?type=3"
}
]
}
},
{
"message": "Test status update 123",
"id": "..._..."
}
],
"paging": {
"previous": "https://graph.facebook.com/v2.8/.../feed?fields=message,attachments&format=json&since=...&access_token=...&limit=25&__paging_token=enc_...&__previous=1",
"next": "https://graph.facebook.com/v2.8/.../feed?fields=message,attachments&format=json&access_token=...&limit=25&until=...&__paging_token=enc_..."
}
}
當在getPostPicture
函數中使用for循環時,i變量實際上是數組feedData
的元素,因此必須使用i.id
或i.attachments
和i.message
。 我還認為,由於您在2個循環中使用相同的j
,其中一個嵌套在另一個循環中,因此它也無法正常工作,因此您可能還必須更改它,並用您期望的輸出類型向您解釋問題。
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