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How NodeJS implements WebSocket function

php中世界最好的语言Original: 2018-04-12 16:57:274091browse

This time I will show you how NodeJS implements the WebSocket function. What are the precautions for NodeJS to implement the WebSocket function. The following is a practical case, let's take a look.

We develop based on express and socket.io. First we need toinstallthe following packages

npm install --save express
npm install --save socket.io

Server-side code:

var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);
app.get('/', function(req, res){
  res.send('<h1>Welcome Realtime Server</h1>');
});
io.on('connection', function(socket){
  console.log('a user connected');
  socket.on("disconnect", function() {
    console.log("a user go out");
  });
  socket.on("message", function(obj) {
    io.emit("message", obj);
  });
});
http.listen(3000, function(){
  console.log('listening on *:3000');
});

Client code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <script src="http://127.0.0.1:3000/socket.io/socket.io.js"></script>
</head>
<body>
  <ul id="message"></ul>
  <script>
    socket = io.connect('ws://127.0.0.1:3000');
    socket.emit("message", {"name" : navigator.userAgent, "msg" : "hello world"});
    socket.on("message", function(obj) {
      console.log(obj);
    });
  </script>
</body>
</html>

A console version of the chat room is ready (^o^)/~

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!

How NodeJS implements WebSocket function

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