How NodeJS implements WebSocket function-JS Tutorial-php.cn

How NodeJS implements WebSocket function

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Release： 2018-04-12 16:57:27

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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

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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');
});

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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>

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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!