- Ava terminal source/repos, et luua uus kaust.
3. Avame Visual Studio Code ja installime ws-raamatukogu
(npm install ws).
4. Ava projekt VS Code’is ja loo index.js
5. Node’i WebSocket’i sisaldamine.
const http = require("http")
const fs = require("fs")
const ws = new require("ws")6. Serveri seadistamine
const wss = new ws.Server({noServer: true});
function accept(req, res) {
if(req.url === "/ws" && req.header.upgrade &&
req.headers.update.toLowerCase() === "websocket" &&
req.headers.connection.match(/\bupgrade\b/i)){
wss.handleUpdgrede(req, req.socker, Buffer.alloc(0), onSocketConnect);
}
else if (req.url === "/") { //index.html
fs.createReadStream("./index.html").pipe(res);
}
else {
res.writeHead(404);
res.end();
}
}7. Loome index.html
<!doctype html>
<form name="publish">
<input type="text" name="message" maxlength="50"/>
<input type="submit" value="Send"/>
</form>
<div id="messages"></div>
<script>
let url = location.host == 'localhost' ?
'ws://localhost:8080/ws' : location.host == 'javascript.local' ?
`ws://javascript.local/article/websocket/chat/ws` : // dev integration with local site
`wss://javascript.info/article/websocket/chat/ws`; // prod integration with javascript.info
//создаем объект с вебсокетом
let socket = new WebSocket(url);
// отправляем сообщение на форму
document.forms.publish.onsubmit = function() {
let outgoingMessage = this.message.value;
socket.send(outgoingMessage);
return false;
};
// обрабатываем входящие сообщения
socket.onmessage = function(event) {
let incomingMessage = event.data;
showMessage(incomingMessage);
};
//если пользователь закрыт сокет, то пишем об этом в консоли
socket.onclose = event => console.log(`Closed ${event.code}`);
// показываем сообщения в div#messages
function showMessage(message) {
let messageElem = document.createElement('div');
messageElem.textContent = message;
document.getElementById('messages').prepend(messageElem);
}
</script>8. Ühenduse loomine
// Kliendide loomine
const clients = new Set();
// Ühenduse loomine
function onSocketConnect(ws){
clients.add(ws);
ws.on('message', function(message) {
message = message.slice(0, 50); //maksimaalne pikkus on 50'
for(let client of clients) {client.send(message);}
});
ws.on('close', function(){
console.log("connection closed");
clients.delete(ws);
});
}
9. Teksti kuvamine
let log;
if(!module["parent"]){
log = console.log;
http.createServer(accept).listen(8080);
} else{
log = function() {};
exports.accept = accept;
}Kontrollimine:
Käivitame faili index.js Node.js abil.
Ava fail index.html fail exploreri kaudu.
