Nodejs + Socket. io implement communication instance code, nodejssocket. io

Nodejs + Socket. io implement communication instance code, nodejssocket. io

Directory structure

D:. │ package.json │ server.js │ └─public index.html socket.io.js

Required Conditions

• Socket. io. js is used to initialize io on the front-end interface.
• Socket. io is used by NodeJs to provide the socket method.

Socket. io. js exists in socket. io-client

Socket. io exists in socket. io

Demonstration Functions

• The client sends a message to the server.
• Notify the client of backend Triggering Events
• Server event triggered when the client leaves

Server

Server. js

Var express = require ('express '); var app = express (); var server = require ('http '). createServer (app); var io = require ('socket. io ') (server); app. use ('/', express. static (_ dirname + '/public'); server. listen (80); // socket I/O. on ('connection', function (socket) {// receives and processes the client's hi event socket. on ('hi', function (data) {console. log (data); // triggers the client event c_hi socket. emit ('C _ Hi', 'Hello too! ')}) // Disconnect the event socket. on ('disconnect', function (data) {console. log ('disconnections ', data) socket. emit ('C _ leave ', 'leaves'); // socket. broadcast is used to broadcast to the entire network (except itself) // socket. broadcast. emit ('C _ leave ', 'someone leaves ')})});

• Connection is used to process socket link events.
• Disconnect handles connection disconnection events
• The backend accepts frontend eventssocket.on(EventName,function(date){})
• The backend triggers the frontend eventsocket.emit(EventName,msg)

This backend demonstrates that the frontend sends a message to the backend to trigger the hi event. The hi event notifies the frontend through callback when the c_hi event defined by the triggering client is triggered.

Client

Index.html

<! DOCTYPE html> 


 
 
 
  
The send message button is used to send messages to the server and trigger the hi events defined by the server.
 
 
  
The exit button is used to exit the page, that is, the socket is automatically disconnected. Trigger the disconnect defined by the server.
 

 
Source code download: Socket_jb51.rar

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