websocket+node建立聊天室简单使用
1.建立新的文件夹dome
2.执行 npm init加载package.json文件
3.node不支持websocket所以npm install ws 下载 ws插件
4.建立index.html文件代码如下
<!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:8090/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.");
}
}
</script>
<form onsubmit="return false;">
<h3>WebSocket 聊天室：</h3>
<textarea id="responseText" style="width: 500px; height: 300px;"></textarea>
<br />
<input type="text" name="message" style="width: 300px" value="Welcome to waylau.com" />
<input type="button" 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>
</body>
</html>
5.建立index.js文件代码如下
const WebSocket = require("ws");
const server = new WebSocket.Server({ port: 8090 });
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);
}
});
});
});
6.启动代码 node index.js
7.在浏览器打开index.html 就可以查看了
