【Web前端问题】websocket 用于nodejs统计在线人数

我想用websocket来统计在线人数。登陆成功，转到home.html.在home显示在线人数，但是，不停报错
，我接触nodejs不多，选修作业实在有点应付不来，希望得到指导，谢谢
图片描述

html代码如下：

    <!--统计在线人数-->
                  当前在线人数: <span id="count"></span> <br/>

里面还有：

$(document).ready(function () {
                 // 创建链接
                var socket = io.connect('http://localhost:3000');
                socket.on('stats', function(data) {
                console.log('Connected clients:', data.numClients);
                $('#count').text(data.numClients);
                });
        });

index.js 代码如下：

var express = require('express');
var router = express.Router();
var path = require('path');
var WebSocket = require('ws');
var WebSocketServer = WebSocket.Server;
var io = new WebSocketServer({
    port: 3000
});
var numClients = 0;
//统计人数
io.on('connection', function(socket) {  
        numClients++;
        io.emit('stats', { numClients: numClients });
        console.log('Connected clients:', numClients);
        socket.on('disconnect', function() {
        numClients--;
        io.emit('stats', { numClients: numClients });
        console.log('Connected clients:', numClients);
    });
});

回答：

websocket链接成功之后，操作的上下文是socket对象。io.on('connection', cb)中cb包含的io改为socket

const express = require('express');
const http = require('http');
const WebSocket = require('ws');
const app = express(); 
const server = http.createServer(app);
const io = new WebSocket.Server({ server });
var numClients = 0;
//统计人数
io.on('connection', function(socket) {  
        numClients++;
        socket.emit('stats', { numClients: numClients });
        console.log('Connected clients:', numClients);
        socket.on('disconnect', function() {
        numClients--;
        socket.emit('stats', { numClients: numClients });
        console.log('Connected clients:', numClients);
    });
});
server.listen(3000, function listening() {
  console.log('Listening on %d', server.address().port);
});

soonfy

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