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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
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!
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