Question

所以我一直在尝试学习编码，并一直使用codeAcademy作为资源。我目前正在做一个石头，剪刀，纸的练习，我的代码运行正常，但是我的上一个console.log(determineWinner(userChoice, computerChoice));"向控制台扔了一个undefined。任何帮助将不胜感激。

const getUserChoice = (userInput) => {
  userInput = userInput.toLowerCase();
  if (userInput === 'rock' || userInput === 'paper' || userInput === 'scissors') {
    return userInput;
  } else {
    console.log('Error!');
  }
}

const getComputerChoice = () => {
  switch (Math.floor(Math.random() * 3)) {
    case 0:
      return 'rock';
    case 1:
      return 'paper';
    case 2:
      return 'scissors';
  }
}

const determineWinner = (userChoice, computerChoice) => {
  if (getUserChoice === getComputerChoice) {
    return 'the game was a tie';
  }
}
if (getUserChoice === 'rock') {
  if (getComputerChoice === 'paper') {
    return 'computer won!';
  } else {
    return 'you won!';
  }
}
if (getUserChoice === 'paper') {
  if (getComputerChoice === 'scissors') {
    return 'computer won!';
  } else {
    return 'you won!';
  }
}
if (getUserChoice === 'scissors') {
  if (getComputerChoice === 'rock') {
    return 'computer won!';
  } else {
    return 'you won!';
  }
}
const playGame = () => {
  const userChoice = getUserChoice('rock');
  const computerChoice = getComputerChoice();
  console.log(`You threw: ${userChoice}`);
  console.log(`The computer threw: ${computerChoice}`);
  console.log(determineWinner(userChoice, computerChoice));
};
playGame();

Answer 1

忽略您在此处发布的代码中的一个小语法错误，无效代码的问题是在函数determineWinner中，您有两个分别名为userChoice和{{1}的变量}。但是，错误地，您正在使用computerChoice和getUserChoice。

getComputerChoice

JavaScript抛出未定义

1 个答案: