我在Windows上运行并使用WAMP作为本地主机服务器。我已经搜索了很多教程,尝试了很多东西等但仍然无效......
现在写一下,在我的www /目录中,我创建了一个名为socketiodemo
的文件夹。
在其中,我做了npm install socket.io
并安装了一些其他节点包:
我安装了上述所有软件包,即使我实际上并不需要它们。我刚刚安装了它们,因为很多教程需要它们但是我宁愿不使用它们而只是使用javascript来获取纯socket.io。
所以,这是我的目录在www:
下的快照我发现的一个最简单的教程给了我这个app.js代码,这是服务器端:
// Require HTTP module (to start server) and Socket.IO
var http = require('http'), io = require('socket.io');
// Start the server at port 8080
var server = http.createServer(function(req, res){
// Send HTML headers and message
res.writeHead(200,{ 'Content-Type': 'text/html' });
res.end('<h1>Hello Socket Lover!</h1>');
});
server.listen(8080);
// Create a Socket.IO instance, passing it our server
var socket = io.listen(server);
// Add a connect listener
socket.sockets.on('connection', function(client){
// Create periodical which ends a message to the client every 5 seconds
var interval = setInterval(function() {
client.send('This is a message from the server! ' + new Date().getTime());
},5000);
// Success! Now listen to messages to be received
client.on('message',function(event){
console.log('Received message from client!',event);
});
client.on('disconnect',function(){
clearInterval(interval);
console.log('Server has disconnected');
});
});
以下是客户端代码的index.html:
<!DOCTYPE html>
<html>
<head>
<style>
* { margin:0; padding:0; font-size:11px; font-family:arial; color:#444; }
body { padding:20px; }
#message-list { list-style-type:none; width:300px; height:300px; overflow:auto; border:1px solid #999; padding:20px; }
#message-list li { border-bottom:1px solid #ccc; padding-bottom:2px; margin-bottom:5px; }
code { font-family:courier; background:#eee; padding:2px 4px; }
</style>
<script src="http://cdn.socket.io/stable/socket.io.js"></script>
<script>
// Create SocketIO instance
var socket = new io.Socket('localhost',{
port: 8080
});
socket.connect();
// Add a connect listener
socket.on('connect',function() {
log('<span style="color:green;">Client has connected to the server!</span>');
});
// Add a connect listener
socket.on('message',function(data) {
log('Received a message from the server: ' + data);
});
// Add a disconnect listener
socket.on('disconnect',function() {
log('<span style="color:red;">The client has disconnected!</span>');
});
// Sends a message to the server via sockets
function sendMessageToServer(message) {
socket.send(message);
log('<span style="color:#888">Sending "' + message + '" to the server!</span>');
}
// Outputs to console and list
function log(message) {
var li = document.createElement('li');
li.innerHTML = message;
document.getElementById('message-list').appendChild(li);
}
</script>
</head>
<body>
<p>Messages will appear below (and in the console).</p><br />
<ul id="message-list"></ul>
<ul style="margin:20px 0 0 20px;">
<li>Type <code>socket.disconnect()</code> to disconnect</li>
<li>Type <code>socket.connect()</code> to reconnect</li>
<li>Type <code>sendMessageToServer('Your Message')</code> to send a message to the server</li>
</ul>
</body>
</html>
客户端代码旨在通过在chrome检查器中动态调用sendMessageToServer('Your Message')
来工作。
所以,是时候运行服务器了。 WAMP在线,并转到www / socketiodemo并执行
node app.js
给我输出:
info - socket.io started
现在,转到localhost / socketiodemo,会反复显示以下日志:
XMLHttpRequest cannot load http://localhost:8080/socket.io/xhr-polling//1338578840544. Origin http://localhost is not allowed by Access-Control-Allow-Origin.
XMLHttpRequest cannot load http://localhost:8080/socket.io/xhr-polling//1338578850545. Origin http://localhost is not allowed by Access-Control-Allow-Origin.
现在服务器(节点app.js)开始显示以下消息:
info - socket.io started
warn - unknown transport: "undefined"
info - unhandled socket.io url
warn - unknown transport: "undefined"
info - unhandled socket.io url
warn - unknown transport: "undefined"
此外,在客户端中,执行sendMessageToServer('Hello');
只是附加到ul:
Sending "hello" to the server!
但实际上并没有对服务器做任何事情。服务器只是转储上面的info
和warn
。客户端也在连续执行上面显示的XMLHttpRequest
错误。
你能确定问题出在哪里吗?我实际上已经尝试了很多教程和东西,这是我最接近工作的东西。
如果有人还想建议他们知道可行的教程,请这样做。
答案 0 :(得分:4)
一些Socket.IO的东西随着时间的推移而发生了变化。此外,您可能希望从同一主机/端口提供HTML和Socket.IO JS。试一试:
将index.html移至public
目录
这样你就拥有了以下树:
app.js
public/
index.html
node_modules/
socket.io
express
(whatever else)
修改app.js以投放HTML
将您的app.js更改为以下JavaScript(仅改变前几行):
// Require Express module (to start server) and Socket.IO
var io = require('socket.io'), express = require('express');
var server = express.createServer();
server.use(express.static(__dirname + "/public"));
server.listen(8080);
// Create a Socket.IO instance, passing it our server
var socket = io.listen(server);
// Add a connect listener
socket.sockets.on('connection', function(client){
// Create periodical which ends a message to the client every 5 seconds
var interval = setInterval(function() {
client.send('This is a message from the server! ' + new Date().getTime());
},5000);
// Success! Now listen to messages to be received
client.on('message',function(event){
console.log('Received message from client!',event);
});
client.on('disconnect',function(){
clearInterval(interval);
console.log('Server has disconnected');
});
});
使用此代码,当您访问localhost时,您的服务器将使用Express来提供index.html
:8080
更改您的Socket.IO代码
在index.html
中,将您的<script>
标记更改为:<script src="/socket.io/socket.io.js"></script>
,然后将JavaScript更改为只读(仅第一部分更改):
// Create SocketIO instance
var socket = io.connect();
// Add a connect listener
socket.on('connect',function() {
log('<span style="color:green;">Client has connected to the server!</span>');
});
// Add a connect listener
socket.on('message',function(data) {
log('Received a message from the server: ' + data);
});
// Add a disconnect listener
socket.on('disconnect',function() {
log('<span style="color:red;">The client has disconnected!</span>');
});
// Sends a message to the server via sockets
function sendMessageToServer(message) {
socket.send(message);
log('<span style="color:#888">Sending "' + message + '" to the server!</span>');
}
// Outputs to console and list
function log(message) {
var li = document.createElement('li');
li.innerHTML = message;
document.getElementById('message-list').appendChild(li);
}
启动您的服务器并访问localhost:8080
请注意,这会一起跳过WAMP堆栈; Node.js同时提供Socket.IO代码和静态文件。当您访问localhost:8080时,您应该看到消息。另请注意,您应使用socket.socket.disconnect()
断开连接并socket.socket.connect()
重新连接。
源代码
此应用的工作版本的源代码位于https://github.com/BinaryMuse/so-10856370;记住npm install express socket.io
!