Node (websocket)

WebSocket was originally a feature of long links under HTML5 and is currently supported by many browsers.

In the WebSocket protocol, a handshake is first exchanged over HTTP to explicitly upgrade the protocol to WebSocket. A TCP channel is also established to exchange data in frame frames.

In the node environment, the basic functions can be achieved as follows:

First NPM Install Socket.io

1, app.js, initialize Socket.io

var function () {  console.log (' Express server listening on port ' + app.get (' Port ');}); var io     = require (' Socket.io '). Listen (SRV); server.initserver (IO);

2, Server.js implement server-side code

function (IO) {        io.on (' connection ',function(socket) {        console.log (' connection ');        Socket.on (' disconnect ',function(msg) {            console.log (' disconnect ');        });                Socket.on (' msg1 ',function(msg) {            console.log (msg);                        Socket.emit (' back ', {key: ' Fredric&sinny '});     });}

3. Client code

<! DOCTYPE html> var socket = io.connect (' http://localhost:3000 ');         function sendmsg () {               console.log (' Start sendmsg ');        Socket.emit (' Msg1 ', {key: ' Fredric '});        Socket.on (' back ',function(msg) {        alert (msg.key);    });     </script>
The browser-side debug network interface is as follows:
Node (websocket)