Odin Project石头剪刀布游戏：Console.log未输出预期分数问题

我正在完成Odin Project的石头剪刀布课程作业，目前已完成大部分功能，但在分数统计与胜者展示的最终环节遇到问题。问题出在playRound和game函数中，尤其是值的返回逻辑，playerScore与computerScore未按预期递增，怀疑是作用域相关问题。以下是原始代码：

let choices = ["Rock", "Paper", "Scissors"]
let computerSelection = getComputerChoice();

let rockRegex = /rock/i;
let paperRegex = /paper/i;
let scissorsRegex = /scissors/i;
let result = "";

function getPlayerChoice() {
    prompt("Rock, Paper, Scissors? ")
}

function getComputerChoice() {
    let computerChoice = choices[Math.floor(Math.random()*choices.length)];
    // console.log(computerChoice);
    return computerChoice;
}

let playerScore = 0;
let computerScore = 0;
function playRound(playerSelection, computerSelection) {
    if (rockRegex.test(playerSelection)) {
        if (computerSelection == "Rock") {
            console.log(computerScore);
            return result = "It's a draw! You both had Rock";
        } else if (computerSelection == "Paper") {
            // add score to computer since it won
            computerScore++;
            console.log(computerScore);
            return result = "You lose! Paper beats Rock";
        } else if (computerSelection == "Scissors") {
            // add score to player since you won
            playerScore++;
            console.log(computerScore);
            return result = "You win! Rock beats Scissors";
        }

    } else if (paperRegex.test(playerSelection)) {
        if (computerSelection == "Rock") {
            // add score to player since you won
            playerScore++;
            console.log(computerScore);
            return result = "You win! Paper beats Rock";
        } else if (computerSelection == "Paper") {
            console.log(computerScore);
            return result = "It's a draw! You both had Paper";
        } else if (computerSelection == "Scissors") {
            // add score to computer since you won
            computerScore++;
            console.log(computerScore);
            return result = "You lose! Scissors beat Paper";
        }

    } else if (scissorsRegex.test(playerSelection)) {
        if (computerSelection == "Rock") {
            // add score to computer since you won
            computerScore++;
            console.log(computerScore);
            return result = "You lose! Rock beats Scissors";
        } else if (computerSelection == "Paper") {
            // add score to player since you won
            playerScore++;
            console.log(computerScore);
            return result = "You win! Scissors beats Paper";
        } else if (computerSelection == "Scissors") {
            return result = "It's a draw! You both had Scissors";
        }
    }
}

function game() {
    for (let i = 0; i < 2; i++) {
        console.log(result);
        getPlayerChoice();
        playRound();
        console.log("Computer Score:", computerScore, "Your Score:", playerScore);
    }
}

game();

问题排查与修复点 #

• getPlayerChoice无返回值：函数内调用prompt但未返回结果，导致无法获取玩家输入的选择。修改后添加return：

  function getPlayerChoice() {
      return prompt("Rock, Paper, Scissors? ")
  }
  

• playRound调用未传参：game函数中调用playRound()时没有传递玩家选择和电脑选择，导致函数内参数为undefined，无法进入胜负判断分支。修改game函数，每轮获取新的玩家选择和电脑随机选择：

  function game() {
      for (let i = 0; i < 5; i++) { // 改为常规的5局制
          const playerChoice = getPlayerChoice();
          const computerChoice = getComputerChoice();
          playRound(playerChoice, computerChoice);
          console.log(result);
          console.log("Computer Score:", computerScore, "Your Score:", playerScore);
      }
      // 游戏结束后判定最终胜者
      if (playerScore > computerScore) {
          console.log("恭喜你，最终获胜！");
      } else if (computerScore > playerScore) {
          console.log("很遗憾，电脑最终获胜！");
      } else {
          console.log("最终平局！");
      }
  }
  

• 全局computerSelection初始化逻辑错误：原全局变量仅初始化一次，导致电脑全程出同一个选择。现在每轮在game中调用getComputerChoice()生成新选择，保证每轮随机出拳。

• 调试日志冗余/错误：部分console.log(computerScore)场景不符（比如玩家获胜时打印电脑分数），可根据调试需求调整日志内容。

修改后的完整代码 #

let choices = ["Rock", "Paper", "Scissors"];
let rockRegex = /rock/i;
let paperRegex = /paper/i;
let scissorsRegex = /scissors/i;
let result = "";

function getPlayerChoice() {
    return prompt("Rock, Paper, Scissors? ");
}

function getComputerChoice() {
    let computerChoice = choices[Math.floor(Math.random() * choices.length)];
    return computerChoice;
}

let playerScore = 0;
let computerScore = 0;
function playRound(playerSelection, computerSelection) {
    if (rockRegex.test(playerSelection)) {
        if (computerSelection === "Rock") {
            result = "It's a draw! You both had Rock";
        } else if (computerSelection === "Paper") {
            computerScore++;
            result = "You lose! Paper beats Rock";
        } else if (computerSelection === "Scissors") {
            playerScore++;
            result = "You win! Rock beats Scissors";
        }
    } else if (paperRegex.test(playerSelection)) {
        if (computerSelection === "Rock") {
            playerScore++;
            result = "You win! Paper beats Rock";
        } else if (computerSelection === "Paper") {
            result = "It's a draw! You both had Paper";
        } else if (computerSelection === "Scissors") {
            computerScore++;
            result = "You lose! Scissors beat Paper";
        }
    } else if (scissorsRegex.test(playerSelection)) {
        if (computerSelection === "Rock") {
            computerScore++;
            result = "You lose! Rock beats Scissors";
        } else if (computerSelection === "Paper") {
            playerScore++;
            result = "You win! Scissors beats Paper";
        } else if (computerSelection === "Scissors") {
            result = "It's a draw! You both had Scissors";
        }
    } else {
        result = "请输入有效的选择：Rock、Paper或Scissors！";
    }
}

function game() {
    for (let i = 0; i < 5; i++) {
        const playerChoice = getPlayerChoice();
        if (!playerChoice) break; // 处理用户取消输入的情况
        const computerChoice = getComputerChoice();
        playRound(playerChoice, computerChoice);
        console.log(`第${i+1}轮结果：${result}`);
        console.log(`当前比分：你 ${playerScore} - ${computerScore} 电脑`);
    }
    // 最终结果判定
    if (playerScore > computerScore) {
        console.log("🎉 恭喜你，五局三胜，最终获胜！");
    } else if (computerScore > playerScore) {
        console.log("😔 很遗憾，电脑最终获胜！");
    } else {
        console.log("🤝 最终平局！");
    }
}

game();

内容的提问来源于stack exchange，提问作者pranitgarg