NodeJS+Express+Socket.io的一个简单例子

浏览数：40 / 时间：2015年06月09日

初始化一个NodeJS web应用：

打开CMD窗口。

运行cmd:“mkdir myapp”，新建一个文件夹，名为myapp。

运行cmd：“cd myapp”，切换到文件夹myapp。

运行cmd：“npm init”，创建文件package.json。

 

3.Express入门应用：

在上面的CMD窗口运行cmd：“npm install express --save”, 安装“express” node_module, "--save"表示保存express到package.json。

添加文件app.js到myapp文件夹，假设package.json里面的main是app.js。

//app.js

var app = require(‘express‘)();
var http = require(‘http‘).Server(app);

app.get(‘/‘, function(req, res){
  res.send(‘<h1>Hello world</h1>‘);
});

http.listen(3000, function(){
  console.log(‘listening on *:3000‘);
});

运行cmd：“node app”，启动myapp。

在Chrome里打开“http://localhost:3000/”，显示“Hello world”。

在CMD窗口里输入“Ctrl+C”，可终止myapp的运行。

 

4.Socket.io入门应用

在上面的CMD窗口运行：“npm install --save socket.io”。

添加index.html到myapp文件夹，内容如下：

<!doctype html>
<html>
  <head>
    <title>Socket.IO chat</title>
    <style>
      * { margin: 0; padding: 0; box-sizing: border-box; }
      body { font: 13px Helvetica, Arial; }
      form { background: #000; padding: 3px; position: fixed; bottom: 0; width: 100%; }
      form input { border: 0; padding: 10px; width: 90%; margin-right: .5%; }
      form button { width: 9%; background: rgb(130, 224, 255); border: none; padding: 10px; }
      #messages { list-style-type: none; margin: 0; padding: 0; }
      #messages li { padding: 5px 10px; }
      #messages li:nth-child(odd) { background: #eee; }
    </style>
  </head>
    
  <body>  
    <ul id="messages"></ul>
    <form action="">
      <input id="m" autocomplete="off" /><button>Send</button>
    </form>
      
    <script src="/socket.io/socket.io.js"></script>
    <script src="http://code.jquery.com/jquery-1.11.1.js"></script>
    <script>
      var socket = io();
      $(‘form‘).submit(function(){
        socket.emit(‘chat message‘, $(‘#m‘).val());
        $(‘#m‘).val(‘‘);
        return false;
      });
    
      socket.on(‘chat message‘, function(msg){
        $(‘#messages‘).append($(‘<li>‘).text(msg));
      });
    </script>
  </body>
</html>

修改app.js如下：

//app.js

var app = require(‘express‘)();
var http = require(‘http‘).Server(app);
var io = require(‘socket.io‘)(http);

app.get(‘/‘, function(req, res){
  res.sendfile(‘index.html‘);
});

io.on(‘connection‘, function(socket){
  console.log(‘a user connected‘);
    
  socket.on(‘chat message‘, function(msg){
    console.log(‘message: ‘ + msg);

    io.emit(‘chat message‘, msg);
  });

});

app.set(‘port‘, process.env.PORT || 3000);

var server = http.listen(app.get(‘port‘), function() {
  console.log(‘start at port:‘ + server.address().port);
});

再次运行“node index”，用Chrome打开“http://localhost:3000/”，显示如下“

 

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