參考:https://www.nodebeginner.org/index-zh-tw.html
1. 開啟PowerShell並安裝
npm install express <- 框架
npm install ws <- websocket
2. service.js
const WebSocket = require('ws');
const server = new WebSocket.Server({ port: 8080 });
server.on('open', function open() {
console.log('connected');
});
server.on('close', function close() {
console.log('disconnected');
});
server.on('connection', function connection(ws, req) {
const ip = req.connection.remoteAddress;
const port = req.connection.remotePort;
const clientName = ip + port;
console.log('%s is connected', clientName)
ws.send("Welcome " + clientName);
ws.on('message', function incoming(message) {
console.log('received: %s from %s', message, clientName);
server.clients.forEach(function each(client) {
if (client.readyState === WebSocket.OPEN) {
client.send( clientName + " -> " + message);
}
});
});
});
3. client.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>WebSocket Chat</title>
</head>
<body>
<script type="text/javascript">
var socket;
if (!window.WebSocket) {
window.WebSocket = window.MozWebSocket;
}
if (window.WebSocket) {
socket = new WebSocket("ws://localhost:8080/ws");
socket.onmessage = function (event) {
var ta = document.getElementById('responseText');
ta.value = ta.value + '\n' + event.data
};
socket.onopen = function (event) {
var ta = document.getElementById('responseText');
ta.value = "connection!";
};
socket.onclose = function (event) {
var ta = document.getElementById('responseText');
ta.value = ta.value + "connection close";
};
} else {
alert("你的浏览器不支持 WebSocket！");
}
function send(message) {
if (!window.WebSocket) {
return;
}
if (socket.readyState == WebSocket.OPEN) {
socket.send(message);
} else {
alert("connection fail.");
}
}
</script>
<form onsubmit="return false;">
<h3>WebSocket Chat room：</h3>
<textarea id="responseText" style="width: 500px; height: 300px;"></textarea>
<br>
<input type="text" name="message" style="width: 300px" value="Welcome">
<input type="button" value="Send" onclick="send(this.form.message.value)">
<input type="button" onclick="javascript:document.getElementById('responseText').value=''"
value="Clean">
</form>
<br>
</body>
</html>
4. 伺服器端啟動service.js
客戶端透過瀏覽器開啟client.html即可對話
sudo kill $(ps aux | grep 'app.js' | awk '{print $2}')
sudo node service.js &
