nodejs--socketIo的基础应用

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一》socketIo：socketIo是node.js中的一个模块，提供通过websocket进行通讯的一种简单方式。
websocket:服务器和客户端之间实现实时通讯的响应方式。基本思想是：在服务器和客户端之间保持连接持久打开。websocket不支持重新连接处理。

二》socketIo的简单实用：
要想在服务器端加入socketIo的功能，必须将Socket.Io包括进来，而后将其附加到服务器上，如：
var io=require('socket.io').listen(server);
io.socket.on('connection',function(socket){

   console.log("user connected");
   socket.on('disconnection',function(){
   console.log("user disconnected");
});

});
这时，会把socketIo绑定到服务器上，具备了和客户端交互的功能。SocketIo可以监听到许多时间，比如客户端的连接和断开连接。

2）客户端连接到服务器
为了让浏览器可以连接到服务器，那么客户端就必须使用Socket.Io中低的客户端JavaScript库，然后连接到服务器，如：
<script src="/socket.io/socket.io.js"></script>
<script>var socket=io.connect('http://127.0.0.1:3000')</script>

3)测试：
app.js(服务器段)
var http = require('http');
var fs = require('fs');

var server = http.createServer(function (req, res) {
fs.readFile('./index.html', function(error, data) {
    res.writeHead(200, { 'Content-Type': 'text/html' });
    res.end(data, 'utf-8');
});
}).listen(3000, "127.0.0.1");
console.log('Server running at http://127.0.0.1:3000/');

var io = require('socket.io').listen(server);

io.sockets.on('connection', function (socket) {
console.log('User connected');
socket.on('disconnect', function () {
    console.log('User disconnected');
});
});

index.html：
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8" />
    <title>Socket.IO Example</title>
</head>
<body>
    <h1>Socket.IO Example</h1>
    <script src="/socket.io/socket.io.js"></script>
    <script>
      var socket = io.connect('http://127.0.0.1:3000');
    </script>

</body>
</html>

测试结果如下：
D:\nodejs\socketTest>node app.js
Server running at http://127.0.0.1:3000/
   info - socket.io started
   debug - served static content /socket.io.js
   debug - client authorized
   info - handshake authorized 13729343131701654457
   debug - setting request GET /socket.io/1/websocket/13729343131701654457
   debug - set heartbeat interval for client 13729343131701654457
   debug - client authorized for
   debug - websocket writing 1::
User connected
   debug - emitting heartbeat for client 13729343131701654457
   debug - websocket writing 2::
   debug - set heartbeat timeout for client 13729343131701654457
   debug - got heartbeat packet
   debug - cleared heartbeat timeout for client 13729343131701654457
   debug - set heartbeat interval for client 13729343131701654457
   debug - client authorized
   info - handshake authorized 10810714391399389314
   debug - setting request GET /socket.io/1/websocket/10810714391399389314
   debug - set heartbeat interval for client 10810714391399389314
   debug - client authorized for
   debug - websocket writing 1::
User connected
   info - transport end
   debug - set close timeout for client 10810714391399389314
   debug - cleared close timeout for client 10810714391399389314
   debug - cleared heartbeat interval for client 10810714391399389314
User disconnected
   debug - discarding transport
   debug - emitting heartbeat for client 13729343131701654457
   debug - websocket writing 2::
   debug - set heartbeat timeout for client 13729343131701654457
   debug - got heartbeat packet
   debug - cleared heartbeat timeout for client 13729343131701654457
   debug - set heartbeat interval for client 13729343131701654457

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