node.js - 套接字IO 3.0，不接收服务器上的发射

Question

后配置

import express from "express";
import SocketIO from "socket.io";
import http from "http";
import cors from "cors";

const app = express();
app.use(cors());
const server = http.createServer(app);
const io = SocketIO(server);

const PORT = 5000;

io.on("connection", (socket) => {
  console.log("Connected!!");

  socket.on("send_message", (data) => {
    console.log('SEND_MESSAGE');
    console.log(data);
  });

  socket.on("disconnect", () => {
    console.log("Close.-.--.");
  });
});

server.listen(PORT, () => {
  console.log(`Server on port => ${PORT}`);
});

前线实现

import io from "socket.io-client";

let socket;

const Home = () => {
  useEffect(() => {
    socket = io("localhost:5000", {
      // transports: ["websocket"],
      // upgrade: false,
    });

    return () => socket.disconnect();
  }, []);


  const onEnter = () => {
    socket.emit("send_message", { message: messageToSend });
    setMessageToSend("");
  };

我收到了Connect and Disconnect发出的消息，但是我无法获得send_message发出的消息，帮助! :c，我看到一些视频和类(class)无法获得我想要的结果，不要判断我，我是套接字io的新手

Answer 1

我对React不太了解，但是在前端，应该是:

socket = io.connect("http://localhost:9000");

另外，如果它不起作用，则从 useEffect()中删除断开连接代码并进行测试。如果工作正常，则表示在发出事件触发之前，您的套接字已断开连接。