Javascript 调用服务器时未找到socket.io
我正在尝试连接Angular和Nodejs服务器上的socket.io 在Angular中,我声明了一个新的套接字并连接它Javascript 调用服务器时未找到socket.io,javascript,node.js,sockets,Javascript,Node.js,Sockets,我正在尝试连接Angular和Nodejs服务器上的socket.io 在Angular中,我声明了一个新的套接字并连接它 import * as io from 'socket.io-client'; ... @component ... const socket = io.connect('http://localhost:3000'); 在后端:server.js const express = require('express'); const app = express(); var
import * as io from 'socket.io-client';
...
@component
...
const socket = io.connect('http://localhost:3000');
在后端:server.js
const express = require('express');
const app = express();
var http = require('http').Server(app);
var io = require('socket.io')(http);
io.set('origins', 'http://localhost:4200');
var routes = require('./routes/routes')(io);
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
app.use(function (req, res, next) {
res.header("Access-Control-Allow-Origin", "http://localhost:4200");
res.header("Access-Control-Allow-Methods", "GET, POST, PUT ,DELETE");
res.header('Access-Control-Allow-Credentials', true);
res.header(
"Access-Control-Allow-Headers",
"Origin, X-Requested-With, Content-Type, Accept"
);
next();
});
io.on('connection', function (socket) {
socket.emit('news', { hello: 'world' });
console.log("connectd");
});
app.use('/', routes);
var server = app.listen(3000, function (io) {
})
应用程序正在编译并从服务器获取数据。但只有socket.io不工作
我得到这个错误:
获取404(未找到)
socket.io
连接到http
:
var http = require('http').Server(app);
var io = require('socket.io')(http);
因此,您必须使用:
http.listen(3000)
而不是
app.listen(3000) // This will only start an express server
您的套接字服务器永远不会启动,这就是为什么您会得到404,因为只有express
正在运行