Socket.io客户端无法正确从服务器接收数据

Question

server.js

var app = require('http').createServer(handler)
  , io = require('socket.io').listen(app)
  , fs = require('fs')

app.listen(process.env.PORT);

function handler (req, res) {
  fs.readFile(__dirname + '/index.html',
  function (err, data) {
    if (err) {
      res.writeHead(500);
      return res.end('Error loading index.html');
    }

    res.writeHead(200);
    res.end(data);
  });
}

io.sockets.on('connection', function (socket) {
  socket.emit('message', { msg: 'world' });
  socket.on('message', function (msg) {
    console.log(msg);
    console.log('That was a message from the client :)');
  });
});

index.html:

<script src="/socket.io/socket.io.js"></script>
<script>
  var socket = io.connect('EDITED');
  document.write("test");
  socket.on('message', function (msg) {
    alert(msg);
    //console.log(data);
    socket.emit('message', { msg: 'hello there server' });
  });
</script>

The server is accepting the message "hello there server" and displaying it correctly in the console; However, when the server sends the message "hello" to the client, the client is supposed to give a pop up alert that should read "hello". Instead of the pop up alert saying "hello", it says: [object Object]

Any ideas?

Answer 1

The response is an object:

socket.on('message', function(data) {
    alert(data.msg);

I'd consider using console.log when sending debug messages like this, as you can see the structure instead of just [object Object] .