为什么我的函数总是返回相同的值？

Question

最近在学习 Javascript，所以我正在学习在对象中存储函数。 目前正在创建一个简单的石头、纸、剪刀游戏。 我被卡住了，我需要 getWinner 函数来确定获胜者，并向函数添加了 3 个条件 = 平局、赢或输。 现在的问题是，它总是返回给我。 任何人都可以帮忙吗？

 const startGameBtn = document.getElementById('start-game-btn'); let ROCK = "ROCK"; let PAPER = "PAPER"; let SCISSORS = "SCISSORS"; let RESULT_DRAW = "It's a draw"; let RESULT_PLAYER_WINS = "Player Wins"; let RESULT_COMPUTER_WINS = "Player Wins"; let GAME_IS_RUNNING = false; let getPlayerChoice = function () { let selection = prompt(`${ROCK},${PAPER}, or ${SCISSORS}? `, '').toUpperCase(); if (selection !== ROCK && selection !== PAPER && selection !== SCISSORS) { alert ("Invalid choice, defaulted to Rock"); selection = ROCK; } return selection } const getComputerChoice = function() { const randomValue = Math.floor(Math.random() * 2); if (randomValue === 0) { return ROCK; } else if (randomValue === 1) { return PAPER; } else if (randomValue === 2) { return SCISSORS; }; } const getWinner = function (cChoice, pChoice) { if (cChoice === pChoice) { return RESULT_DRAW; } else if (cChoice === ROCK && pChoice === PAPER || cChoice === PAPER && pChoice === SCISSORS || cChoice === SCISSORS && pChoice === ROCK ) { return RESULT_PLAYER_WINS; } else { return RESULT_COMPUTER_WINS; } } startGameBtn.addEventListener('click', function () { if (GAME_IS_RUNNING) { return } GAME_IS_RUNNING = true; console.log("Game is starting...."); let playerChoice = getPlayerChoice(); console.log(playerChoice); let computerChoice = getComputerChoice(); console.log(computerChoice); let winner = getWinner(computerChoice, playerChoice); console.log(winner); });

 <button id="start-game-btn">Start</button>

Answer 1

只修复电脑永远无法选择剪刀的问题，它运行正常。 也许你只是幸运地抽奖了。

 const startGameBtn = document.getElementById('start-game-btn'); let ROCK = "ROCK"; let PAPER = "PAPER"; let SCISSORS = "SCISSORS"; let RESULT_DRAW = "It's a draw"; let RESULT_PLAYER_WINS = "Player Wins"; let RESULT_COMPUTER_WINS = "Player Wins"; let GAME_IS_RUNNING = false; let getPlayerChoice = function() { let selection = prompt(`${ROCK},${PAPER}, or ${SCISSORS}? `, '').toUpperCase(); if (selection !== ROCK && selection !== PAPER && selection !== SCISSORS) { alert("Invalid choice, defaulted to Rock"); selection = ROCK; } return selection } const getComputerChoice = function() { const randomValue = Math.floor(Math.random() * 3); // <---- if (randomValue === 0) { return ROCK; } else if (randomValue === 1) { return PAPER; } else if (randomValue === 2) { return SCISSORS; }; } const getWinner = function(cChoice, pChoice) { if (cChoice === pChoice) { return RESULT_DRAW; } else if (cChoice === ROCK && pChoice === PAPER || cChoice === PAPER && pChoice === SCISSORS || cChoice === SCISSORS && pChoice === ROCK ) { return RESULT_PLAYER_WINS; } else { return RESULT_COMPUTER_WINS; } } startGameBtn.addEventListener('click', function() { if (GAME_IS_RUNNING) { return } GAME_IS_RUNNING = true; console.log("Game is starting...."); let playerChoice = getPlayerChoice(); console.log(playerChoice); let computerChoice = getComputerChoice(); console.log(computerChoice); let winner = getWinner(computerChoice, playerChoice); console.log(winner); });

 <button id="start-game-btn">START-STOP</button>