WebSocket是什么？
WebSocket是一种网络通信协议，RFC6455定义了它的通信标准。
WebSocket是HTML5可以提供的一种在单个TCP连接上进行全双工通讯的协议。
服务器代码
var express = require('express');
var http = require('http');
var WebSocket = require('ws');
var app = express();
app.use(express.static(__dirname));
var server = http.createServer(app);
var wss = new WebSocket.Server({server});
wss.on('connection', function connection(ws) {
console.log('开始连接！');
ws.on('message', function incoming(data) {
console.log('接收到了消息！');
/**
* 把消息发送到所有的客户端
* wss.clients获取所有链接的客户端
*/
wss.clients.forEach(function each(client) {
client.send(data);
});
});
});
server.listen(8000, function listening() {
console.log('服务器启动成功！');
});
客户端代码
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>在线聊天</title>
</head>
<body>
<input type="text">
<script>
var wsServer = new WebSocket('ws://127.0.0.1:8000');
wsServer.onopen = function (e) {
(typeof e == 'string') && wsServer.send(e);//向后台发送数据
};
wsServer.onclose = function (e) {//当链接关闭的时候触发
};
wsServer.onmessage = function (e) {//后台返回消息的时候触发
console.log(e);
};
wsServer.onerror = function (e) {//错误情况触发
}
</script>
</body>
</html>
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