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,但仍然没有任何效果。
当前设置
所以现在写,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
并安装了其他一些节点包:
- socket.io
- 表达
- 笔尖
- 唱针
安装了上述所有软件包,即使我实际上并不需要它们。我只是安装了它们,因为很多教程都需要它们,但我宁愿不使用它们,而只是使用 javascript 进行纯粹的 socket.io。
所以,这是我在 www 下的目录的快照:
- 应用.js
- 索引.html
- node_modules
- socket.io
- 表达
- 笔尖
- 唱针
找到的最精简的教程之一给了我这个应用程序.js代码,它是服务器端:
// 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');
});
});
以及以下索引.html用于客户端代码:
<!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 的检查器中动态调用sendMessageToServer('Your Message')
来工作。
电流输出
所以,是时候运行服务器了。WAMP在线,并访问www/socketiodemo并做
node app.js
给我输出:
info - socket.io started
现在,转到localhost/socketiodemo,重复显示以下日志:
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(节点应用程序.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执行任何操作。服务器只是连续转储上面的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,这是我最接近让某些东西工作的东西。
如果有人还想建议一个他们知道会起作用的教程,请这样做。
Socket.IO 的东西随着时间的推移而改变。此外,您可能希望从同一主机/端口提供HTML和 Socket.IO JS。试一试:
将索引.html移动到public
目录中
这样你就有了以下树:
app.js
public/
index.html
node_modules/
socket.io
express
(whatever else)
修改应用程序.js以提供 HTML
将你的应用.js更改为以下 JavaScript(只有前几行会更改):
// 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:8080 时,您的服务器将使用 Express 来提供index.html
更改 Socket.IO 代码
在 index.html
中,将 <script>
标记更改为 read: <script src="/socket.io/socket.io.js"></script>
,然后将 JavaScript 更改为 read(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);
}
启动服务器并访问本地主机:8080
请注意,这会一起跳过 WAMP 堆栈;Node.js 既提供 Socket.IO 代码,也提供静态文件。当您访问 localhost:8080 时,您应该会看到这些消息。另请注意,应使用socket.socket.disconnect()
断开连接,socket.socket.connect()
重新连接。
源代码
此应用程序的工作版本的源代码在 https://github.com/BinaryMuse/so-10856370;记得npm install express socket.io
!