Question

我正在尝试开发一个简单的聊天应用程序。这是我的 chat.js 文件。

var app = require('http').createServer(handler)
, io = require('socket.io').listen(app)
, fs = require('fs');
app.listen(8124);
function handler (req, res) {
fs.readFile(__dirname + '/chat.html',
function (err, data) {
if (err) {
res.writeHead(500);
return res.end('Error loading chat.html');
}
res.writeHead(200);
res.end(data);
});
}
io.sockets.on('connection', function (socket) {
    socket.on('addme',function(username) {
        socket.username = username;
        socket.emit('chat', 'SERVER', 'You have connected');
        socket.broadcast.emit('chat', 'SERVER', username + ' is on deck');
    });
    socket.on('sendchat', function(data) {
        io.sockets.emit('chat', socket.username, data);
    });
    socket.on('disconnect', function() {
        io.sockets.emit('chat', 'SERVER', socket.username + ' has left the building');
    });
});

我的 chat.html 文件。

<head>
<meta charset="utf-8">
<title>bi-directional communication</title>
<script src="/socket.io/socket.io.js"></script>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script>
$(document).ready(function(e) {
    var socket = io.connect('http://localhost:8124/');
    $('#submit').click(function(e) {
        e.preventDefault();
        v = $('#uname').val();
        $('#username').html('');
        socket.emit('addme', v);
    });

    socket.on('chat',function(username, data) {
        var p = document.createElement('p');
        p.innerHTML = username + ': ' + data;
        document.getElementById('output').appendChild(p);
    });
    window.addEventListener('load',function() {
        document.getElementById('sendtext').addEventListener('click',
        function() {
            var text = document.getElementById('data').value;
            socket.emit('sendchat', text);
        }, false);
    }, false);

});
</script>
</head>
<body>
<div id="output"></div>
<div id="username">
  <input type="text" name="uname" id="uname">
  <input type="submit" name="submit" id="submit" value="Submit">
</div>
<div id="send">
  <input type="text" id="data" size="100" /><br />
<input type="button" id="sendtext" value="Send Text" />
</div>
</body>
</html>

我在node.js命令提示符＆amp;中输入 node chat.js 来测试代码。然后在浏览器地址栏中输入http://localhost:8124/。问题是虽然这在IE9上完美运行，但Firefox和Chrome上没有任何反应。

当我在chrome或firefox上运行时，我在Node.js命令提示符下收到以下内容。

info  - socket.io started
   debug - served static content /socket.io.js
   debug - client authorized
   info  - handshake authorized 0yJjYvt7o36BTX6T_hXA
   debug - setting request GET /socket.io/1/websocket/0yJjYvt7o36BTX6T_hXA
   debug - set heartbeat interval for client 0yJjYvt7o36BTX6T_hXA
   debug - client authorized for
   debug - websocket writing 1::
   debug - setting request GET /socket.io/1/xhr-polling/0yJjYvt7o36BTX6T_hXA?t=1
341573194770
   debug - setting poll timeout
   debug - discarding transport
   debug - cleared heartbeat interval for client 0yJjYvt7o36BTX6T_hXA
   debug - setting request GET /socket.io/1/jsonp-polling/0yJjYvt7o36BTX6T_hXA?t
=1341573204771&i=0
   debug - setting poll timeout
   debug - discarding transport
   debug - clearing poll timeout
   debug - clearing poll timeout
   debug - jsonppolling writing io.j[0]("8::");
   debug - set close timeout for client 0yJjYvt7o36BTX6T_hXA
   debug - jsonppolling closed due to exceeded duration
   debug - setting request GET /socket.io/1/jsonp-polling/0yJjYvt7o36BTX6T_hXA?t
=1341573224817&i=0
   debug - setting poll timeout
   debug - discarding transport
   debug - cleared close timeout for client 0yJjYvt7o36BTX6T_hXA
   debug - clearing poll timeout
   debug - jsonppolling writing io.j[0]("8::");
   debug - set close timeout for client 0yJjYvt7o36BTX6T_hXA
   debug - jsonppolling closed due to exceeded duration
   debug - setting request GET /socket.io/1/jsonp-polling/0yJjYvt7o36BTX6T_hXA?t
=1341573244856&i=0

然后继续。请帮忙。

Answer 1

谢谢你ebohlman你的时间，但我解决了这个问题。在我的 chat.js 中，我添加了以下内容。

io.configure('development', function(){
  io.set('transports', ['xhr-polling']);
});

现在我的chat.js看起来像。

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

app.listen(8124);

io.configure('development', function(){
  io.set('transports', ['xhr-polling']);
});

function handler (req, res) {
fs.readFile(__dirname + '/chat.html',
function (err, data) {
if (err) {
res.writeHead(500);
return res.end('Error loading chat.html');
}
res.writeHead(200);
res.end(data);
});
}
io.sockets.on('connection', function (socket) {
    socket.on('addme',function(username) {
        socket.username = username;
        socket.emit('chat', 'SERVER', 'You have connected');
        socket.broadcast.emit('chat', 'SERVER', username + ' is on deck');
    });
    socket.on('sendchat', function(data) {
        io.sockets.emit('chat', socket.username, data);
    });
    socket.on('disconnect', function() {
        io.sockets.emit('chat', 'SERVER', socket.username + ' has left the building');
    });
});

但我仍然不知道可能导致错误的原因。如果您知道请解释！

Answer 2

尝试发布到AppFog时遇到了同样的问题。它是由AppFog尚未支持的websockets引起的，所以你的修复工作通过强制socket.io来使用长轮询/ AJAX。 AppFog正在根据他们的网站开发支持websockets，但没有给出日期。

我发现大多数云PaaS提供商不幸的是不支持websockets。我现在测试的一个值得注意的例外是Nodejitsu：http://nodejitsu.com/

Answer 3

我认为这有助于了解该问题及其修复方法我搜索了很多，最后我得到了它

What does "xhr-polling" config do in socket.io?

谢谢

Socket.io不适用于Firefox＆amp;铬

3 个答案: