简单的 Express 3.x socket.io 聊天 [英] simple Express 3.x socket.io chat

问题描述

这里有一些代码来自一个非常流行的网络教程.为了使用 Express 3.x，进行了一些更改.

这里是app.js的代码:

 var express = require('express'), http = require('http');var app = express();var server = http.createServer(app);var io = require('socket.io').listen(server);服务器.听(8000)；//路由app.get('/', function (req, res) {res.sendfile(__dirname + '/index.html');});//当前连接到聊天的用户名var 用户名 = {};io.sockets.on('connection', function (socket) {//当客户端发出sendchat"时，它会监听并执行socket.on('sendchat', 函数(数据){//我们告诉客户端使用 2 个参数执行updatechat"io.sockets.emit('updatechat', socket.username, data);});//当客户端发出adduser"时，它会监听并执行socket.on('adduser', 函数(用户名){//我们将用户名存储在此客户端的套接字会话中socket.username = 用户名；//将客户端的用户名添加到全局列表中用户名[用户名] = 用户名；//回显给他们已经连接的客户端socket.emit('updatechat', 'SERVER', '你已经连接');//全局(所有客户端)回显一个人已连接socket.broadcast.emit('updatechat', 'SERVER', username + '已连接');//更新聊天中的用户列表，客户端io.sockets.emit('updateusers', 用户名);});//当用户断开连接时.. 执行此操作socket.on('断开', function(){//从全局用户名列表中删除用户名删除用户名[socket.username];//更新聊天中的用户列表，客户端io.sockets.emit('updateusers', 用户名);//全局回显这个客户端已经离开socket.broadcast.emit('updatechat', 'SERVER', socket.username + '已断开连接');});});

上述代码与网络教程中的代码相同，只是使用 Riwels 的回答 .

这里是 index.html 的代码:

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script><脚本>var socket = io.connect('http://localhost:8080');//在连接到服务器时，使用匿名回调请求用户名socket.on('connect', function(){//调用服务端函数'adduser'并发送一个参数(提示的值)socket.emit('adduser', prompt("你叫什么名字?"));});//侦听器，每当服务器发出updatechat"时，就会更新聊天正文socket.on('updatechat', 函数(用户名，数据){$('#conversation').append('<b>'+用户名+':</b>'+数据+'<br>');});//侦听器，每当服务器发出updateusers"时，就会更新用户名列表socket.on('updateusers', function(data) {$('#users').empty();$.each(data, function(key, value) {$('#users').append('
' + key + '
');});});//在页面加载时$(函数(){//当客户端点击 SEND 时$('#datasend').click( function() {var message = $('#data').val();$('#data').val('');//告诉服务器执行 'sendchat' 并发送一个参数socket.emit('sendchat', message);});//当客户端按下键盘上的 ENTER 键时$('#data').keypress(function(e) {if(e.which == 13) {$(this).blur();$('#datasend').focus().click();}});});<div style="float:left;width:100px;border-right:1px solid black;height:300px;padding:10px;overflow:scroll-y;"><b>用户</b><div id="用户"></div>

<div style="float:left;width:300px;height:250px;overflow:scroll-y;padding:10px;"><div id="对话"></div><input id="data" style="width:200px;"/><input type="button" id="datasend" value="send"/>

Socket.io 启动良好，但该应用程序尚未显示任何消息.你能让这个工作吗?

解决方案

index.html 中存在错误.我忘了像在 app.js 中那样更改端口.现在它完美地工作.

index.html 的工作代码:

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script><脚本>var socket = io.connect('http://localhost:8000');//在连接到服务器时，使用匿名回调请求用户名socket.on('connect', function(){//调用服务端函数'adduser'并发送一个参数(提示的值)socket.emit('adduser', prompt("你叫什么名字?"));});//侦听器，每当服务器发出updatechat"时，就会更新聊天正文socket.on('updatechat', 函数(用户名，数据){$('#conversation').append('<b>'+用户名+':</b>'+数据+'<br>');});//侦听器，每当服务器发出updateusers"时，就会更新用户名列表socket.on('updateusers', function(data) {$('#users').empty();$.each(data, function(key, value) {$('#users').append('
' + key + '
');});});//在页面加载时$(函数(){//当客户端点击 SEND 时$('#datasend').click( function() {var message = $('#data').val();$('#data').val('');//告诉服务器执行 'sendchat' 并发送一个参数socket.emit('sendchat', message);});//当客户端按下键盘上的 ENTER 键时$('#data').keypress(function(e) {if(e.which == 13) {$(this).blur();$('#datasend').focus().click();}});});<div style="float:left;width:100px;border-right:1px solid black;height:300px;padding:10px;overflow:scroll-y;"><b>用户</b><div id="用户"></div>

<div style="float:left;width:300px;height:250px;overflow:scroll-y;padding:10px;"><div id="对话"></div><input id="data" style="width:200px;"/><input type="button" id="datasend" value="send"/>

Here is some code from a very popular webtutorial. Some changes were made in order to use Express 3.x.

here is the code of app.js:

 var express = require('express')
  , http = require('http');

var app = express();
var server = http.createServer(app);
var io = require('socket.io').listen(server);

server.listen(8000);
// routing
app.get('/', function (req, res) {
  res.sendfile(__dirname + '/index.html');
});

// usernames which are currently connected to the chat
var usernames = {};

io.sockets.on('connection', function (socket) {

    // when the client emits 'sendchat', this listens and executes
    socket.on('sendchat', function (data) {
        // we tell the client to execute 'updatechat' with 2 parameters
        io.sockets.emit('updatechat', socket.username, data);
    });

    // when the client emits 'adduser', this listens and executes
    socket.on('adduser', function(username){
        // we store the username in the socket session for this client
        socket.username = username;
        // add the client's username to the global list
        usernames[username] = username;
        // echo to client they've connected
        socket.emit('updatechat', 'SERVER', 'you have connected');
        // echo globally (all clients) that a person has connected
        socket.broadcast.emit('updatechat', 'SERVER', username + ' has connected');
        // update the list of users in chat, client-side
        io.sockets.emit('updateusers', usernames);
    });

    // when the user disconnects.. perform this
    socket.on('disconnect', function(){
        // remove the username from global usernames list
        delete usernames[socket.username];
        // update list of users in chat, client-side
        io.sockets.emit('updateusers', usernames);
        // echo globally that this client has left
        socket.broadcast.emit('updatechat', 'SERVER', socket.username + ' has disconnected');
    });
});

The obove code is the same code as in the webtutorial only some changes for Express 3.x were made using the answer of Riwels .

here is the code of index.html:

    <script src="/socket.io/socket.io.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
<script>
    var socket = io.connect('http://localhost:8080');

    // on connection to server, ask for user's name with an anonymous callback
    socket.on('connect', function(){
        // call the server-side function 'adduser' and send one parameter (value of prompt)
        socket.emit('adduser', prompt("What's your name?"));
    });

    // listener, whenever the server emits 'updatechat', this updates the chat body
    socket.on('updatechat', function (username, data) {
        $('#conversation').append('<b>'+username + ':</b> ' + data + '<br>');
    });

    // listener, whenever the server emits 'updateusers', this updates the username list
    socket.on('updateusers', function(data) {
        $('#users').empty();
        $.each(data, function(key, value) {
            $('#users').append('<div>' + key + '</div>');
        });
    });

    // on load of page
    $(function(){
        // when the client clicks SEND
        $('#datasend').click( function() {
            var message = $('#data').val();
            $('#data').val('');
            // tell server to execute 'sendchat' and send along one parameter
            socket.emit('sendchat', message);
        });

        // when the client hits ENTER on their keyboard
        $('#data').keypress(function(e) {
            if(e.which == 13) {
                $(this).blur();
                $('#datasend').focus().click();
            }
        });
    });

</script>
<div style="float:left;width:100px;border-right:1px solid black;height:300px;padding:10px;overflow:scroll-y;">
    <b>USERS</b>
    <div id="users"></div>
</div>
<div style="float:left;width:300px;height:250px;overflow:scroll-y;padding:10px;">
    <div id="conversation"></div>
    <input id="data" style="width:200px;" />
    <input type="button" id="datasend" value="send" />
</div>

Socket.io starts well but the app doesn't show any messages yet. Can you get this to work?

解决方案

there was a bug in index.html. I forgot to change the port as i did in app.js. Now it works perfectly.

the working code of index.html:

 <script src="/socket.io/socket.io.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
<script>
    var socket = io.connect('http://localhost:8000');

    // on connection to server, ask for user's name with an anonymous callback
    socket.on('connect', function(){
        // call the server-side function 'adduser' and send one parameter (value of prompt)
        socket.emit('adduser', prompt("What's your name?"));
    });

    // listener, whenever the server emits 'updatechat', this updates the chat body
    socket.on('updatechat', function (username, data) {
        $('#conversation').append('<b>'+username + ':</b> ' + data + '<br>');
    });

    // listener, whenever the server emits 'updateusers', this updates the username list
    socket.on('updateusers', function(data) {
        $('#users').empty();
        $.each(data, function(key, value) {
            $('#users').append('<div>' + key + '</div>');
        });
    });

    // on load of page
    $(function(){
        // when the client clicks SEND
        $('#datasend').click( function() {
            var message = $('#data').val();
            $('#data').val('');
            // tell server to execute 'sendchat' and send along one parameter
            socket.emit('sendchat', message);
        });

        // when the client hits ENTER on their keyboard
        $('#data').keypress(function(e) {
            if(e.which == 13) {
                $(this).blur();
                $('#datasend').focus().click();
            }
        });
    });

</script>
<div style="float:left;width:100px;border-right:1px solid black;height:300px;padding:10px;overflow:scroll-y;">
    <b>USERS</b>
    <div id="users"></div>
</div>
<div style="float:left;width:300px;height:250px;overflow:scroll-y;padding:10px;">
    <div id="conversation"></div>
    <input id="data" style="width:200px;" />
    <input type="button" id="datasend" value="send" />
</div>

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