简单实现架构图

安装webSocket

npm install websocket

启动程序前配置package.json

{
  "scripts": {
    "start": "node index.js 8080"
  },
  "dependencies": {
    "websocket": "^1.0.34"
  }
}

服务端程序: serverClient.js

var WebSocket = require('websocket').server
var http = require('http')

// 创建httpServer
var httpServer = http.createServer().listen(8080,function (){
    console.log('http://127.0.0.1:8080')
})

// 创建webSocketServer
var wsServer = new WebSocket({
    httpServer:httpServer,
    autoAcceptConnections:false
})

wsServer.on('request',function (request){
    var connection = request.accept()
    connection.on('message',function (msg){
        console.log(msg)

        // 发送给客户端
        connection.send(msg.utf8Data)
    })
})

客户端程序: Client.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div id="msg"></div>
    <input type="text" id="text">
    <input type="submit" value="发送" onclick="send()">

    <script>
        var websocket = new WebSocket('ws://localhost:8080');
        // ws ---> http
        // wss ---> https

        websocket.readyState
        // 0 链接还没有建立
        // 1 连接建立成功
        // 2 连接正在关闭
        // 3 连接已经关闭
        websocket.onopen = function () {
            console.log(websocket.readyState)
        }
        
        function send() {
            var text = document.getElementById('text').value
            websocket.send(text)
        }

        websocket.onmessage = function (backMsg){
            console.log(backMsg.data)
        }
    </script>

</body>
</html>

客户端：服务端：