Node.js：在客户端处理JSON对象

阿尔瓦罗

使用时，我无法JSON在Node.js服务器的客户端处理对象socket.io。

这就是我发送数据的方式（我正在读取的文件具有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");
    });
});

我打电话JSON.stringify给二进制文件以可读的格式data。

现在，在客户端，我<script>在html的内部有以下代码块<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>

运行得很好，我有一个段落<p id="json"></p>占用了整个文本块，但是如果我尝试访问已解析的JSON元素并进行打印，例如使用console.log(obj.timestamp)get ，则将其打印出来，例如“ timestamp”标签undefined。

如何处理接收到的数据，以便将其作为常规JSON处理？

编辑

这是输出console.log(obj)：

{
"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 "
                    }
                }
            ]
        }
    }
]
}

根据JSON Lint的说法，它是有效的json，但是undefined当我尝试访问“时间戳”标签时仍然遇到问题

阿尔瓦罗

我发送了错误的数据格式，正确的代码是：

io.on('connection', function(socket){
    console.log("A user connected");
    fs.readFile('/.../file.json', 'utf-8', function(err, data){
        socket.emit('news', data.toString());
    });
    socket.on('disconnect', function(){
        console.log("A user disconnected");
    });
});

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