得分“未定义”javascript

Question

在这个奥丁课程中有一个任务是制作“石头、剪刀、布”游戏。当尝试添加计分计数器时，即使通过程序正确跟踪了玩家和计算机的分数，分数也会返回为“未定义”。关于如何解决这个问题有什么建议吗？

代码：

let Choices = ["Rock", "Paper", "Scissors"];
let playerScore = 0;
let computerScore = 0;


function getComputerChoice() {
    let random = Math.floor(Math.random() * Choices.length);

    return Choices[random];
}

function playRound(playerSelection, computerSelection) {
    if (playerSelection === computerSelection) {
        return "Draw!";
    }
    else if (playerSelection.toLowerCase() === "rock" && computerSelection === "Paper") {
        computerScore++;
        return ("Computer Wins!");
    }
    else if (playerSelection.toLowerCase() === "rock" && computerSelection === "Scissors") {
        playerScore++;
        return ("You Win!");
    }
    else if (playerSelection.toLowerCase() === "paper" && computerSelection === "Rock") {
        playerScore++;
        return ("You Win!");
    }
    else if (playerSelection.toLowerCase() === "paper" && computerSelection === "Scissors") {
        computerScore++;
        return ("Computer Wins!");
    }
    else if (playerSelection.toLowerCase() === "scissors" && computerSelection === "Rock") {
        computerScore++;
        return ("Computer Wins!");
    }
    else {
        return ("You Win!");
    }
}

function playGame(playerScore, computerScore) {
    for (let i = 0; i < 5; i++){
        let computerSelection = getComputerChoice();
        let playerSelection = "Rock";
        console.log(playRound(playerSelection, computerSelection));
        console.log(`Player: ${playerScore}\nComputer: ${computerScore}`);
    }
}

console.log(playGame());

我已经通过在“if 语句”中的“return 语句”之前使用“console.log()”检查了“playerScore”和“computerScore”是否被正确跟踪。然而，当尝试在“for循环”中正确输出代码时，它只是说“未定义”。

Answer 1

playerScore

和

computerScore

是全局定义的。

通过在

playGame

函数中使用相同名称的参数，您可以隐藏全局参数。由于您调用函数时没有传递这些参数的值，因此它们隐式地

undefined

。

删除这些参数，你应该没问题：

function playGame() {
     // Here ----^