The socket. Io official website uses express to implement the simplest im instant chat. Today we use Koa to implement it.
### Framework preparation
{ "name": "socket-chat-example", "version": "0.0.1", "description": "my first socket.io app", "dependencies": {}}4. Run the following command to install NPM in the command line:
npm install --save koa koa-router http fs socket.io### Add the Code directly next
Directly create index. js under the project directory
VaR Koa = require ('koa'); var APP = new Koa (); const router = require ('koa-router '); const FS = require ('fs '); const Server = require ('HTTP '). createserver (App. callback (); const IO = require ('socket. io ') (server); // home page route let router = new router (); router. get ('/', CTX => {CTX. response. type = 'html '; CTX. response. body = FS. createreadstream ('. /index.html ');}); app. use (router. routes (); // socket connection Io. on ('connection', (socket) => {socket. on ('chat message', (MSG) => {console. log ('message: '+ MSG); Io. emit ('chat message', MSG) ;}); socket. on ('disconnect', () => {console. log ('user disconnected') ;}); // listening port server. listen (3000, () => {console. log ('listening on *: 100 ');});Page index.html
<!doctype html> Like the official website, index.html is not modified.
Finally, execute node index. JS, open the browser, and enter http: // localhost: 3000 to implement the simplest chat. How to Use Koa to implement socket. Io official website examples
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