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[英]how can I print a list of variables within a function using console.log in javascript node.js
[英]In Node.js I m using console.log which is not working
我使用console.log 來顯示端口號,但它不起作用。它顯示字符串,但是當我將它與值一起使用時,它不顯示。
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}');
});
我正在關注:Output:服務器已在端口 ${PORT} 上啟動
你用錯了。 您必須使用反引號 - ` 而不是引號 - '
所以正確的格式是 -
server.listen(PORT,()=>{
return console.log(`server has started on port ${PORT}`);
});
${}
內的表達式,然后 output 評估值。希望這能解決您的問題!
錯誤的報價
使用``
console.log(`server has started on port ${PORT}`);
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