如何修复'io未定义'

Question

I am trying to integrate a socket.io into my project. Code below works fine.

io.on('connection', (socket) => {
  console.log('a user connected');
  socket.on('someEvent', (data) => {
    io.emit('someEvent2', data); 
  });
});

Everything worked well until I put the socket handler into a separate file.

server.js

const socketHandlers = require('./socket/handlers');
io.on('connection', socketHandlers);

handlers.js

const socketHandlers = (socket) => {
  console.log('a user connected');
  socket.on('someEvent', (data) => {
    io.emit('someEvent2', data);    ---here's a problem
  });
};

module.exports = socketHandlers;

Now I get an error - io is not defined. What is the problem here?

Answer 1

Maybe the following link can help you to get your answer ,

link : node.js /socket.io/socket.io.js not found

Answer 2

Install socket.io

npm i socket.io

and then use the below line

var io = require('socket.io');