Play Rock Paper Scissors Online - Simple HTML Game - 常规

<!DOCTYPE html>
<html>
<head>
    <title>Play Rock Paper Scissors Online - Simple HTML Game</title>
    <script>
        //Get user choice from the 3 buttons
        function getUserChoice(userInput) {
            userInput = userInput.toLowerCase();
            if (userInput === 'rock' || userInput === 'paper' || userInput === 'scissors') {
                return userInput;
            } else {
                console.log('Error! Please choose rock, paper, or scissors!');
            }
        }
        //Get computer choice
        function getComputerChoice() {
            var randomNumber = Math.floor(Math.random() * 3);
            switch (randomNumber) {
                case 0:
                    return 'rock';
                case 1:
                    return 'paper';
                case 2:
                    return 'scissors';
            }
        }
        //Determine the winner
        function determineWinner(userChoice, computerChoice) {
            if (userChoice === computerChoice) {
                return 'It's a tie!';
            }
            if (userChoice === 'rock') {
                if (computerChoice === 'paper') {
                    return 'Computer wins!';
                } else {
                    return 'You win!';
                }
            }
            if (userChoice === 'paper') {
                if (computerChoice === 'scissors') {
                    return 'Computer wins!';
                } else {
                    return 'You win!';
                }
            }
            if (userChoice === 'scissors') {
                if (computerChoice === 'rock') {
                    return 'Computer wins!';
                } else {
                    return 'You win!';
                }
            }
        }
        //Start game
        function playGame() {
            var userChoice = getUserChoice('rock');
            var computerChoice = getComputerChoice();
            console.log('You chose ' + userChoice);
            console.log('The computer chose ' + computerChoice);
            console.log(determineWinner(userChoice, computerChoice));
        }
<pre><code>&lt;/script&gt;
</code></pre>
</head>
<body>
    <h1>Play Rock Paper Scissors Online</h1>
    <div>
        <button onclick="playGame('rock')">Rock</button>
        <button onclick="playGame('paper')">Paper</button>
        <button onclick="playGame('scissors')">Scissors</button>
    </div>
</body>
</html>