在 Node.js 中，我正在使用无法正常工作的 console.log

Question

I used console.log to display a port number but it not working.It displaying string but when i use this with value it not displaying.

const http = require('http');
const express = require('express');
const socketio = require('socket.io');

const PORT = process.env.PORT || 5000;

const app = express();
const server = http.createServer(app);
const io = socketio(server);

server.listen(PORT,()=>{
    return console.log('server has started on port ${PORT}');
});

I m getting Following: Output:server has started on port ${PORT}

Answer 1

You are using it wrong. You must use backticks - ` and not quotes - '

So the correct format is -

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

• Quotes ('') will just output whatever is given inside them.
• However, Backticks(``) will evaluate the expression inside ${} and then output the evaluated value.

Hope this solves your issue !

Answer 2

Wrong quotes

Use ``

console.log(`server has started on port ${PORT}`);