我有一些JSON我已经传入Node.js并且我试图解析它并在页面上显示它。但是,在搜索Stack Overflow并尝试各种解决方案(目前正在阅读this)后,我收到此错误作为回报:
TypeError: D:\Programming\node\yale\views\index.jade:10
8| //- p= post.comments[1].data
9| each comment in post.comments
> 10| each text in comment.data
11| p= text.from.name
12|
13|
Cannot read property 'length' of undefined
at $$l (eval at <anonymous> (D:\Programming\node\yale\node_modules\jade\lib\jade.js:172:8), <anonymous>:122:31)
at $$l (eval at <anonymous> (D:\Programming\node\yale\node_modules\jade\lib\jade.js:172:8), <anonymous>:153:4)
at eval (eval at <anonymous> (D:\Programming\node\yale\node_modules\jade\lib\jade.js:172:8), <anonymous>:160:4)
at eval (eval at <anonymous> (D:\Programming\node\yale\node_modules\jade\lib\jade.js:172:8), <anonymous>:301:4)
at eval (eval at <anonymous> (D:\Programming\node\yale\node_modules\jade\lib\jade.js:172:8), <anonymous>:311:21)
at res (D:\Programming\node\yale\node_modules\jade\lib\jade.js:173:38)
at Object.exports.render (D:\Programming\node\yale\node_modules\jade\lib\jade.js:269:10)
at Object.exports.renderFile (D:\Programming\node\yale\node_modules\jade\lib\jade.js:305:18)
at View.exports.renderFile [as engine] (D:\Programming\node\yale\node_modules\jade\lib\jade.js:290:21)
at View.render (D:\Programming\node\yale\node_modules\express\lib\view.js:76:8)
这是我的JSON:
[
{
"id": "362285220481827_740014816042197",
"from": {
"id": "1677018201",
"name": "ABC"
},
"message": "Yo!",
"comments": {
"data": [
{
"id": "740018622708483",
"from": {
"id": "100003969443486",
"name": "XTZ"
},
"message": "Hey!",
"can_remove": false,
"created_time": "2014-06-14T17:18:48+0000",
"like_count": 0,
"user_likes": false
}
],
"paging": {
"cursors": {
"after": "NzQ0MTMxNTc1NjMwNTIx",
"before": "NzQwMDE4NjIyNzA4NDgz"
}
}
}
}
]
Index.jade
扩展布局
block content
each post in datas
div(id='post')
p= post.from.name
p= post.message
//- p= post.comments[1].data
each comment in post.comments
each text in comment.data
p= text.from.name
Index.js
var express = require('express');
var router = express.Router();
var fs = require('fs');
var path = require('path');
var file = '../public/sample.json';
var filePath = path.join(__dirname, '../public/sample.json');
/* GET home page. */
router.get('/', function(req, res) {
fs.readFile(filePath, 'utf8', function(err, data) {
if(err) {
console.log(err);
} else {
data = JSON.parse(data);
res.render('index', { datas: data });
console.log(data);
}
});
});
module.exports = router;
我的问题是,如何检索Comments
对象中的数据?谢谢你的帮助!
答案 0 :(得分:2)
我认为你想迭代帖子数据,而不是对象本身。
each comment in post.comments.data
p= comment.from.name
答案 1 :(得分:1)
comments
不是JSON结构中的数组,它是一个对象。试着把它变成一个阵列。