基于 WebSocket 构建跨浏览器的实时应用
使用示例
1、使用 Node HTTP 服务器
服务端示例代码:
var app = require('http').createServer(handler)
, io = require('socket.io').listen(app)
, fs = require('fs')
app.listen(80);
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('news', { hello: 'world' });
socket.on('my other event', function (data) {
console.log(data);
});
});
客户端示例代码:
<script></script>
var socket = io.connect('http://localhost');
socket.on('news', function (data) {
console.log(data);
socket.emit('my other event', { my: 'data' });
});
2、使用 Express 3 框架
服务端示例代码:
var app = require('express')()
, server = require('http').createServer(app)
, io = require('socket.io').listen(server);
server.listen(80);
app.get('/', function (req, res) {
res.sendfile(__dirname + '/index.html');
});
io.sockets.on('connection', function (socket) {
socket.emit('news', { hello: 'world' });
socket.on('my other event', function (data) {
console.log(data);
});
});
客户端示例代码:
<script></script>
var socket = io.connect('http://localhost');
socket.on('news', function (data) {
console.log(data);
socket.emit('my other event', { my: 'data' });
});
支持的传输
为了给各个不同的浏览器提供实时连接,Socket.IO 选择在运行时会自动最有能力的运输模式,不影响 API 的使用。
- WebSocket
- Adobe Flash Socket
- AJAX 长轮询
- AJAX 多重流
- iframe
- JSONP 轮询
支持的浏览器
桌面端
- Internet Explorer 5.5+
- Safari 3+
- Google Chrome 4+
- Firefox 3+
- Opera 10.61+
移动端
- iPhone Safari
- iPad Safari
- Android WebKit
- WebOs WebKit

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