我在使用socket.io
在Node.js
服务器的客户端处理JSON
对象时遇到问题。Node.js:在客户端处理JSON对象
这是我如何发送数据(我读的文件具有JSON格式):
io.on('connection', function(socket){
console.log("A user connected");
fs.readFile('/.../file.json', 'utf-8', function(err, data){
socket.emit('news', JSON.stringify(data));
});
socket.on('disconnect', function(){
console.log("A user disconnected");
});
});
我为了给一个可读的格式设置为二进制data
调用JSON.stringify
。现在
,在客户端,我有内部的以下<script>
块中的HTML的<body>
:
<script src="/socket.io/socket.io.js"></script>
<script type="text/javascript">
var socket = io();
socket.on('news', function(data){
var obj= JSON.parse(data);
$("#json").text(obj);
});
</script>
这运行正常,我有一个段落<p id="json"></p>
这需要文本的整个块,但如果我尝试访问解析的JSON的一个元素并打印它,例如“时间戳”标签使用console.log(obj.timestamp)
我得到undefined
。
如何处理我收到的数据,以便我可以将其作为常规JSON处理?
编辑
这是console.log(obj)
输出:
{
"timestamp": "Wed Aug 27 13:14:01 CEST 2014",
"devices": [
{
"A": {
"mac": "00:07:80:68:18:41",
"handles": [
{
"TxHandler1": "0418",
"TxHandler2": "020f00072a",
"TxHandler3": "bd",
"a": {
"hnd": "0x0010",
"uuid": "00002800-0000-1000-8000-00805f9b34fb",
"value": "0a 18 "
},
"b": {
"hnd": "0x0011",
"uuid": "00002803-0000-1000-8000-00805f9b34fb",
"value": "02 12 00 29 2a "
},
"c": {
"hnd": "0x0012",
"uuid": "00002a29-0000-1000-8000-00805f9b34fb",
"value": "56 4c "
},
"d": {
"hnd": "0x0013",
"uuid": "00002901-0000-1000-8000-00805f9b34fb",
"value": "46 41 "
},
"e": {
"hnd": "0x0014",
"uuid": "00002803-0000-1000-8000-00805f9b34fb",
"value": "02 15 00 24 2a "
},
"f": {
"hnd": "0x0015",
"uuid": "00002a24-0000-1000-8000-00805f9b34fb",
"value": "31 31 "
},
"g": {
"hnd": "0x0016",
"uuid": "00002901-0000-1000-8000-00805f9b34fb",
"value": "4d 4f 44 "
}
}
]
}
},
{
"B": {
"mac": "00:07:80:68:18:8E",
"handles": [
{
"TxHandler1": "0418",
"TxHandler2": "020f00072a",
"TxHandler3": "bd",
"a": {
"hnd": "0x0010",
"uuid": "00002800-0000-1000-8000-00805f9b34fb",
"value": "0a 18 "
},
"b": {
"hnd": "0x0011",
"uuid": "00002803-0000-1000-8000-00805f9b34fb",
"value": "02 12 00 29 2a "
},
"c": {
"hnd": "0x0012",
"uuid": "00002a29-0000-1000-8000-00805f9b34fb",
"value": "56 4c "
},
"d": {
"hnd": "0x0013",
"uuid": "00002901-0000-1000-8000-00805f9b34fb",
"value": "46 41 "
},
"e": {
"hnd": "0x0014",
"uuid": "00002803-0000-1000-8000-00805f9b34fb",
"value": "02 15 00 24 2a "
},
"f": {
"hnd": "0x0015",
"uuid": "00002a24-0000-1000-8000-00805f9b34fb",
"value": "31 31 "
},
"g": {
"hnd": "0x0016",
"uuid": "00002901-0000-1000-8000-00805f9b34fb",
"value": "4d 4f 44 "
}
}
]
}
}
]
}
其中,根据JSON林特,是一个有效的JSON,但我依然得到undefined
,当我尝试访问“时间戳”标记
也许你应该接受你自己的答案,如果它的工作;) – dgiugg 2014-08-27 11:43:01
我试过了,但它说我需要回来在2天内接受它。我会做;然后;) – 2014-08-27 11:53:38