第一步： 安装 centos ， 按照阿里云的教程 逐步安装即可，
第二步： 安装完后 将server.js 放到 root 目录下 node server.js 发现报错，没有socket.io 错误，处理方式：npm install socket.io 安装 模块。
第三部：这时候server.js 就能运行起来了，但是 linux 需要在后台 运行node项目，就需要安装forever
安装后 启动 就完成了。
客户端源码：
<!DOCTYPE html>
<html>
<head>
<meta charset=\"utf-8\" />
<title>Socket.IO Example</title>
</head>
<body>
<h1>Socket.IO Example</h1>
<script src=\"socket.io-client/socket.io1.js\"></script>
<script>
var socket = io.connect('https://47.75.135.111:8889');
var dataJson = {type:\"alldata\", no: \"sadfdasfads\"};
socket.json.send(dataJson);
socket.on(\"message\", function (message) {
var type = message.type;
alert(message);
});
</script>
</body>
</html>
服务端源码：
var history = new Array();
var clients = [];
var clients_count = 0;
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(8889);
console.log('Server running at https://47.75.135.111:8889/');
var io = require('socket.io').listen(server);
io.sockets.on('connection', function (socket) {
clients_count++;
console.log('Server1');
socket.on('message', function (message) {
console.log(message);
var isjson = typeof(message);
if(isjson!=\"object\"){
message=JSON.parse(message);
}
if (clients[1] == undefined){
clients[1] = [];
}
var no=message.no;
var check=message.check;
var crypto = require('crypto');
var content = no+'niushop';
var md5 = crypto.createHash('md5');
md5.update(content);
var sign = md5.digest('hex');
/if(sign!=check || no ==undefined ){
return false;
}/
if (message.type == \"login\") {
if (clients[message.no] == undefined){
clients[message.no] = [];
}
var objConnect = clients[message.no];
clients[message.no].push(socket);
var itemObj=new Object();
itemObj[\"no\"]=message.no;
itemObj[\"time\"]=new Date().getTime();
history[message.no]=itemObj;
console.log(history);
socket.no = message.no;
var json = { type:\"login\", code: 1 };
socket.json.send(json);
console.log(clients.length);
}else if(message.type == \"alldata\"){
console.log(history);
socket.json.send(JSON.stringify(history));
}else{
console.log('is not have ');
}
});
socket.on('disconnect', function () {
clients_count--;
if(!clients[socket.userid]){
delete clients[socket.userid];
}
});
});
