程式好好玩

var request = require("request");
var fs = require("fs");

var filePath = 'https://www.youtubeinmp3.com/fetch/?
                video=https://www.youtube.com/watch?v=LtpBgAHNVJo';
var saveFile = '三年二班.mp3';

downloadFile(filePath,saveFile).then(function(){
  console.log('下載完成')
}).catch(err => console.error(err))	

function downloadFile(filePath,saveFile){
  return new Promise(function(resolve, reject){
    request.get(filePath).pipe(fs.createWriteStream(saveFile).on('finish',function(err){
      if (err) { reject() }
        resolve();
    }))
  })
}