在角度和節點中使用socket.io時發生404錯誤

Question

我正在使用socket.io制作MEAN應用。 我正在通過節點發送事件，該事件在app.js中包含的index.js文件中定義。 運行我的角度應用程序時出現404錯誤。

let  express = require('express');
let router = express.Router();
let server = require('http').Server(express);
let io = require('socket.io')(server);


/* GET home page. */
router.get('/', function(req, res, next) {
   res.render('index', { title: 'Express' });
});


io.on('connection', (socket) => {
   console.log('User connected');
   socket.emit('hello',{
      greeting: 'Hello agam'
   });
});
module.exports = router;

我在其中包含socket.io並調用我的節點服務器的角度代碼

import { Component, OnInit } from '@angular/core';
import * as socketIo from 'socket.io-client';
@Component({
  selector: 'app-home-component',
  templateUrl: './home-component.component.html',
  styleUrls: ['./home-component.component.css']
})
export class HomeComponentComponent implements OnInit {
  constructor() {

   }

  ngOnInit() {
    const socket = socketIo('http://localhost:3000');
    socket.on('hello', (data) => {
    console.log(data);
    });
  }

 }

我在運行應用程序時遇到的錯誤：

zone.js:2935 GET http://localhost:3000/socket.io/?
EIO=3&transport=polling&t=M4aQ8Fg 404 (Not Found)

這是我的app.js：

var express = require('express');
var path = require('path');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var cors = require('cors');

var index = require('./routes/index');
var users = require('./routes/users');

var app = express();



app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

app.use(cors({origin: true, credentials: true}));

app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', index);
app.use('/users', users);

app.use(function(req, res, next) {
var err = new Error('Not Found');
 err.status = 404;
  next(err);
});

app.use(function(err, req, res, next) {
 res.locals.message = err.message;
 res.locals.error = req.app.get('env') === 'development' ? err : {};

 res.status(err.status || 500);
 res.render('error');
});

module.exports = app;

Answer 1

加：

var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);

...
  // And at end of file
  http.listen(3000, () => {
    console.log('started on port 3000');
  });