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Keyword: Nodejs,express,socket.io.
Os:windows 8.1 with Update Pro.
1. Install the nodejs:http://nodejs.org/.
2. Initialize a Nodejs web app:
Open the cmd window.
Run cmd: "mkdir myapp", create a new folder named MyApp.
Run cmd: "CD MyApp", switch to the folder MyApp.
Run cmd: "NPM init", create file Package.json.
3.Express Getting Started app:
In the cmd window above, run cmd: "NPM install Express--save", install "Express" Node_module, "--save" means save Express to Package.json.
Add the file App.js to the MyApp folder, assuming that Package.json inside the main is app.js.
// App.js var app = require (' Express ') (); var http = require (' http '). Server (app); App.get (function(req, res) { res.send (' );}); Http.listen (function() { console.log (' listening on *:3000 ');});Run cmd: "Node App", start MyApp.
Open "Http://localhost:3000/" in Chrome and show "Hello World".
Enter "CTRL + C" in the CMD window to terminate the operation of MyApp.
4.socket.io Getting Started App
Run in the cmd window above: "NPM install--save Socket.io".
Add index.html to the MyApp folder with the following contents:
<!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 (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> <ulID= "Messages"></ul> <formAction=""> <inputID= "M"AutoComplete= "Off" /><Button>Send</Button> </form> <Scriptsrc= "/socket.io/socket.io.js"></Script> <Scriptsrc= "Http://code.jquery.com/jquery-1.11.1.js"></Script> <Script> varSocket=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>
Modify the App.js as follows:
//App.jsvarApp = require (' Express ')();varHTTP = require (' http '). Server (app);varIO = 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 (' Disconnect ',function() {Console.log (' User disconnected '); }); Socket.on (' Chat message ',function(msg) {Console.log (' Message: ' +msg); Io.emit (' Chat message ', MSG); });}); App.set (' Port ', Process.env.PORT | | 3000);varServer = Http.listen (app.get (' Port '),function() {Console.log (' Start at Port: ' +server.address (). port);});
Run "node index" again and use Chrome to open the " http://localhost:3000/", shown below"
Reference:
nodejs:http://nodejs.org/
expressjs:http://expressjs.com/
socket.io:http://socket.io/
A simple example of Nodejs+express+socket.io
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