如何在每次调用playRound函数时存储playerScore值并累加它？

Question

为什么我的代码每次调用 playRound 函数时都会添加到playerScore，而不是添加到computerScore？

我的项目简介建议在游戏函数中调用 playRound 函数五次，因为我还没有研究如何“循环”代码来重复函数调用。

我的简介：https://www.theodinproject.com/lessons/foundations-rock-paper-scissors

我尝试在调用 playRound 函数时将 1 添加到playerScore 或computerScore（它们被声明为值为0 的全局变量）。

我尝试使用增量运算符 ++ 和 我尝试过使用加法赋值运算符 += 1

我原以为获胜玩家的分数会增加 1。

实际发生了什么： 每次调用 playRound 函数时，playerScore 都会增加 1，这与获胜者的结果不一致。

//write a program to play 'rock, paper, scissors' game against the computer

//COMPUTER CHOICE- generate random choice of weapon
let choice = ['rock', 'paper', 'scissors'];
//select random array element from weapon array
function getComputerChoice() {
  computerChoice = choice[(Math.floor(Math.random() * choice.length))];
  return computerChoice;
}


//USER CHOICE- assign user choice from prompt input
function getPlayerChoice() {
  playerChoice = prompt('Choose your weapon', 'rock, paper or scissors?');
  return playerChoice;
}


//assign values to player variables 
const playerSelection = getPlayerChoice().toLowerCase();
const computerSelection = getComputerChoice();


//message to return to player
let youWin = `You win, ${playerSelection} beats ${computerSelection}`;
let youLose = `You lose, ${computerSelection} beats ${playerSelection}`;
let youDraw = `It's a draw!`;
//put message options into an array
let message = [youWin, youLose, youDraw];


//make global player score variables
let playerScore = 0;
let computerScore = 0;


//function to play one round
function playRound() {

  if (playerSelection == computerSelection) {
    return youDraw;
  } else if (playerSelection == 'rock' && computerSelection == 'paper') {
    computerScore = computerScore++;
    return message[1]; //you lose
  } else if (playerSelection == 'rock' && computerSelection == 'scissors') {
    playerScore++;
    return message[0]; //you win
  } else if (playerSelection == 'paper' && computerSelection == 'rock') {
    playerScore++;
    return message[0]; //you win
  } else if (playerSelection == 'paper' && computerSelection == 'scissors') {
    computerScore++;
    return message[1]; //you lose
  } else if (playerSelection == 'scissors' && computerSelection == 'rock') {
    computerScore++;
    return message[1]; //you lose
  } else if (playerSelection == 'scissors' && computerSelection == 'paper') {
    playerScore++;
    return message[0]; //you win
  } else {
    return ('oops! Type rock, paper or scissors!')
  }
}


//function to play five rounds and report player as winner or loser at the end
function game() {

  //check code: what values are assigned to player selections?
  console.log('player ', playerSelection);
  console.log('computer ', computerSelection);

  playRound();
  playRound();
  playRound();
  playRound();
  playRound();

  return playRound();
}

console.log(game());
console.log(computerScore);
console.log(playerScore);

Answer 1

一些小的更改将解决您的问题。主要的变化是在每一轮中获得玩家选择和计算机选择，而不是只一次。我们还会同时生成 youWin、youLose 等消息。

//write a program to play 'rock, paper, scissors' game against the computer

//COMPUTER CHOICE- generate random choice of weapon
let choice = ['rock', 'paper', 'scissors'];
//select random array element from weapon array
function getComputerChoice() {
  computerChoice = choice[(Math.floor(Math.random() * choice.length))];
  return computerChoice;
}

//USER CHOICE- assign user choice from prompt input
function getPlayerChoice() {
  playerChoice = prompt('Choose your weapon', 'rock, paper or scissors?');
  return playerChoice;
}

//make global player score variables
let playerScore = 0;
let computerScore = 0;

//function to play one round
function playRound() {

  //assign values to player variables 
  const playerSelection = getPlayerChoice().toLowerCase();
  const computerSelection = getComputerChoice();

  //check code: what values are assigned to player selections?
  console.log('player:', playerSelection);
  console.log('computer:', computerSelection);
  
  //message to return to player
  let youWin = `You win, ${playerSelection} beats ${computerSelection}`;
  let youLose = `You lose, ${computerSelection} beats ${playerSelection}`;
  let youDraw = `It's a draw!`;

  if (playerSelection == computerSelection) {
return youDraw;
  } else if (playerSelection == 'rock' && computerSelection == 'paper') {
computerScore++;
return youLose;
  } else if (playerSelection == 'rock' && computerSelection == 'scissors') {
playerScore++;
return youWin;
  } else if (playerSelection == 'paper' && computerSelection == 'rock') {
playerScore++;
return youWin;
  } else if (playerSelection == 'paper' && computerSelection == 'scissors') {
computerScore++;
return youLose;
  } else if (playerSelection == 'scissors' && computerSelection == 'rock') {
computerScore++;
return youLose;
  } else if (playerSelection == 'scissors' && computerSelection == 'paper') {      playerScore++;
return youWin;
  } else {
return ('oops! Type rock, paper or scissors!')
  }
}

//function to play five rounds and report player as winner or loser at the end

function game() {
  for(let round = 0; round < 5; round++) {
console.log(`Round #${round+1}`)
console.log(playRound())
  }
}

game()
console.log('Computer score:', computerScore);
console.log('Player score:', playerScore);

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