一：下面是一个简单的案例，回车发送消息，多人在线聊天
1.前端代码
<!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://10.22.12.12:8080/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 = "连接开启!";
};
socket.onclose = function (event) {
var ta = document.getElementById('responseText');
ta.value = ta.value + "连接被关闭";
};
} 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("连接没有开启.");
}
}
document.onkeydown=function(event){
var code = event.keyCode;
if(code ==13){ //这是键盘的enter监听事件
//绑定焦点，有可能不成功，需要多试试一些标签
document.getElementById("mySend").onclick();
setTimeout(()=>{
document.getElementById("myInput").value = ''
},50)
}
}
</script>
<form onsubmit="return false;">
<h3>WebSocket 聊天室：</h3>
<textarea id="responseText" style="width: 500px; height: 300px;"></textarea>
<br>
<input type="text" id="myInput" name="message" style="width: 300px" value="Hello~~~">
<input type="button" id="mySend" value="发送消息" onclick="send(this.form.message.value)">
<input type="button" onclick="javascript:document.getElementById('responseText').value=''"
value="清空聊天记录">
</form>
<br>
</body>
</html>
2.后端代码
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)
// 发送欢迎信息给客户端
ws.send("Welcome " + clientName);
ws.on('message', function incoming(message) {
console.log('received: %s from %s', message, clientName);
// 广播消息给所有客户端
server.clients.forEach(function each(client) {
if (client.readyState === WebSocket.OPEN) {
client.send( clientName + " -> " + message);
}
});
});
});
参考文章：https://waylau.com/node.js-websocket-chat/