我對這一切都很陌生，我最近開始學習 JavaScript。為了測試我的學習情況，我制作了這個簡單的腳本、石頭剪刀布。它與 Codecademy 項目非常相似。我遇到的問題是輸出，輸出為“未定義”，我無法弄清楚，這個輸出是什么，有人可以幫忙嗎？const getUserChoice = userInput => {  userInput = userInput.toLowerCase();  if (userInput === 'rock') {    return 'Rock'   } else if (userInput === 'paper') {    return 'Paper' }    else if (userInput === 'scissors') {    return 'Scissors'}     else if (userInput === 'bomb') {      return 'Bomb'    } else {        return 'Please input a valid choice!'      }      }const getComputerChoice = () => {  const numbers = (Math.floor(Math.random() * 3))  switch (numbers) {    case 0 : return "Rock";    break;    case 1 : return "Paper";    break;    case 2 : return "Scissors";    break;  } }const determineWinner = (userChoice, computerChoice) => {  if (userChoice === computerChoice) {      return 'It\'s a tie!!';    }   if (userChoice === 'rock') {    if (computerChoice === 'paper') {       return 'The Computer has won the game!!';    } else {        return 'Congratulation You have won the game!!';    }  }  if (userChoice === 'scissors') {    if (computerChoice === 'rock') {      return ('The Computer has won the game!!');    } else {       return ('Congratulations You have won the game!!');    }  }  if (userChoice === 'scissors') {    if (computerChoice === 'paper') {      return 'Cogratulations You have Won the game!!';  } else {      return 'The Computer has won the game!!';  }}  if (userChoice === 'bomb') {    return 'Congratulation you Won!!'  }};const playGame = () => {  var userChoice =  getUserChoice('rock')  var computerChoice = getComputerChoice() console.log('You picked: ' + userChoice); console.log('The computer picked: ' +computerChoice)  console.log(determineWinner(userChoice, computerChoice));} playGame()