网页版井字棋的前端实现

2. CSS 装饰

1. 引入字体和全局样式

@import url("https://fonts.googleapis.com/css2?family=Bungee+Inline&display=swap");
* {
    padding: 0;
    margin: 0;
    box-sizing: inherit;
}

2. 设置 body 样式

body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    text-align: center;
    font-family: "Bungee Inline", cursive;
    color: #f5f5f5;
    overflow: hidden;
    background-image: linear-gradient(to top, #a8edea 0%, #ffc7d9 100%);
}

3. 设置 .wrapper 样式

.wrapper {
    background-color: #55acee53;
    padding: 50px;
}

4. 设置 .current-status 样式

.current-status {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 25px;
}
.current-status p {
    margin: 0 5px 0 0;
    font-size: 24px;
}
.current-status img {
    width: auto;
    height: 32px;
}

5. 设置 board 和 .cell 样式

.board {
    display: grid;
    grid-template-columns: repeat(3, minmax(90px, 1fr));
    grid-template-rows: repeat(3, minmax(90px, 1fr));
    grid-gap: 12px;
    width: 100%;
    height: 100%;
    max-width: 495px;
    margin: 0 auto 15px;
}
.cell {
    cursor: pointer;
    position: relative;
    background-color: #f5f5f5;
    width: 90px;
    height: 90px;
    opacity: 0.5;
    transition: opacity 0.2s ease-in-out;
}
.cell:hover {
    opacity: 1;
}

6. 鼠标悬浮时的图片效果

.board.unicorn .cell:not(.dragon):not(.unicorn):hover::before,
.board.dragon .cell:not(.dragon):not(.unicorn):hover::before {
    content: "";
    width: 70%;
    height: 70%;
    display: block;
    position: absolute;
    background-repeat: no-repeat;
    top: 50%;
    left: 50%;
    transform: translate3d(-50%, -50%, 0);
    background-size: contain;
    opacity: 50%;
}
.board.unicorn .cell:not(.dragon):hover::before {
    background-image: url("./1.gif");
}
.board.dragon .cell:not(.unicorn):hover::before {
    background-image: url("./2.gif");
}

7. 设置 game-end-overlay 样式

.game-end-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #0d1021;
}
.game-end-overlay.show {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

8. 设置 .winning-message 样式

.winning-message {
    margin: -50px 0 20px;
}
.winning-message img {
    width: 100px;
}
.winning-message p {
    font-size: 48px;
    margin: 0;
}

9. 重启按钮样式

.reset-button {
    color: #f5f5f5;
    font-family: "Bungee Inline", cursive;
    font-size: 30px;
    white-space: nowrap;
    border: none;
    padding: 10px 20px;
    background-color: #a186be;
    box-shadow: 5px 5px 0 #55acee;
    cursor: pointer;
    transition: transform 0.1s ease-in-out;
    position: relative;
}
.reset-button:hover {
    transform: scale(1.2);
}
.reset-button:active {
    top: 6px;
    left: 6px;
    box-shadow: none;
    background-color: #9475b5;
}

3. JavaScript 交互

1. 获取页面元素

const board = document.getElementById('board');
const cells = document.querySelectorAll('[data-cell]');
const currentStatus = document.getElementById('currentStatus');
const resetButton = document.getElementById('resetButton');
const gameEndOverlay = document.getElementById('gameEndOverlay');
const currentBeastStatusImg = document.getElementById('currentBeastImg');
const winningMessage = document.querySelector('[data-winning-message]');
const winningMessageText = document.querySelector('[data-winning-message] p');
const winningMessageImg = document.createElement('img');

2. 初始化游戏状态

let gameIsLive = true;
let unicornTurn = true;
let winner = null;

3. 所有获胜组合

const winningCombinations = [
    [0, 1, 2], [3, 4, 5], [6, 7, 8],
    [0, 3, 6], [1, 4, 7], [2, 5, 8],
    [0, 4, 8], [2, 4, 6]
];

4. 设置鼠标悬停时的样式

const setBoardHoverClass = () => {
    board.classList.remove('unicorn');
    board.classList.remove('dragon');
    if (unicornTurn) {
        board.classList.add('unicorn');
    } else {
        board.classList.add('dragon');
    }
}

5. 在格子上放置图片

const placeBeastImg = (cell, currentBeast) => {
    cell.classList.add(currentBeast);
}

6. 切换回合

const swapTurns = () => {
    unicornTurn = !unicornTurn;
}

7. 更新当前状态

const updateCurrentStatus = () => {
    if (unicornTurn) {
        currentBeastStatusImg.src = './1.gif';
        currentBeastStatusImg.alt = 'unicorn';
    } else {
        currentBeastStatusImg.src = './2.gif';
        currentBeastStatusImg.alt = 'dragon';
    }
}

8. 检查是否获胜

const checkWin = (currentBeast) => {
    return winningCombinations.some(combination => {
        return combination.every(i => {
            return cells[i].classList.contains(currentBeast);
        });
    });
}

9. 判断是否平局

const isDraw = () => {
    return [...cells].every(cell => {
        return cell.classList.contains('unicorn') || cell.classList.contains('dragon');
    });
}

10. 开始游戏

const startGame = () => {
    cells.forEach(cell => {
        winningMessageImg.remove();
        cell.classList.remove('unicorn', 'dragon');
        cell.removeEventListener('click', handleCellClick);
        cell.addEventListener('click', handleCellClick, { once: true });
    });
    setBoardHoverClass();
    gameEndOverlay.classList.remove('show');
}

11. 结束游戏

const endGame = (draw) => {
    if (draw) {
        winningMessageText.innerText = `draw!`;
    } else {
        winningMessageImg.src = unicornTurn ? './1.gif' : './2.gif';
        winningMessageImg.alt = unicornTurn ? 'unicorn' : 'dragon';
        winningMessage.insertBefore(winningMessageImg, winningMessageText);
        winningMessageText.innerText = `wins!!!`;
    }
    gameEndOverlay.classList.add('show');
}

12. 处理格子点击事件

const handleCellClick = (e) => {
    const cell = e.target;
    const currentBeast = unicornTurn ? 'unicorn' : 'dragon';
    placeBeastImg(cell, currentBeast);
    if (checkWin(currentBeast)) {
        endGame(false);
    } else if (isDraw()) {
        endGame(true);
    } else {
        swapTurns();
        updateCurrentStatus();
        setBoardHoverClass();
    }
}

13. 重置游戏与启动

resetButton.addEventListener('click', startGame);
startGame();

完整代码

以下是整合后的完整 HTML 文件代码，可直接保存为 .html 文件运行。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>网页版井字棋</title>
    <style>
        @import url("https://fonts.googleapis.com/css2?family=Bungee+Inline&display=swap");
        * { padding: 0; margin: 0; box-sizing: inherit; }
        body { margin: 0; padding: 0; display: flex; justify-content: center; align-items: center; height: 100vh; text-align: center; font-family: "Bungee Inline", cursive; color: #f5f5f5; overflow: hidden; background-image: linear-gradient(to top, #a8edea 0%, #ffc7d9 100%); }
        .wrapper { background-color: #55acee53; padding: 50px; }
        .current-status { display: flex; justify-content: center; align-items: center; margin-bottom: 25px; }
        .current-status p { margin: 0 5px 0 0; font-size: 24px; }
        .current-status img { width: auto; height: 32px; }
        .board { display: grid; grid-template-columns: repeat(3, minmax(90px, 1fr)); grid-template-rows: repeat(3, minmax(90px, 1fr)); grid-gap: 12px; width: 100%; height: 100%; max-width: 495px; margin: 0 auto 15px; }
        .board.unicorn .cell:not(.dragon):not(.unicorn):hover::before, .board.dragon .cell:not(.dragon):not(.unicorn):hover::before { content: ""; width: 70%; height: 70%; display: block; position: absolute; background-repeat: no-repeat; top: 50%; left: 50%; transform: translate3d(-50%, -50%, 0); background-size: contain; opacity: 50%; }
        .board.unicorn .cell:not(.dragon):hover::before { background-image: url("./1.gif"); }
        .board.dragon .cell:not(.unicorn):hover::before { background-image: url("./2.gif"); }
        .cell { cursor: pointer; position: relative; background-color: #f5f5f5; width: 90px; height: 90px; opacity: 0.5; transition: opacity 0.2s ease-in-out; }
        .cell:hover { opacity: 1; }
        .cell.dragon, .cell.unicorn { opacity: 1; position: relative; cursor: not-allowed; }
        .cell.dragon::before, .cell.unicorn::before { content: ""; width: 70%; height: 70%; display: block; position: absolute; background-repeat: no-repeat; top: 50%; left: 50%; transform: translate3d(-50%, -50%, 0); background-size: contain; }
        .cell.dragon::before { background-image: url("./2.gif"); }
        .cell.unicorn::before { background-image: url("./1.gif"); }
        .game-end-overlay { display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0; background-color: #0d1021; }
        .game-end-overlay.show { display: flex; flex-direction: column; justify-content: center; align-items: center; }
        .winning-message { margin: -50px 0 20px; }
        .winning-message img { width: 100px; }
        .winning-message p { font-size: 48px; margin: 0; }
        .btn-container { position: relative; }
        .reset-button { color: #f5f5f5; font-family: "Bungee Inline", cursive; font-size: 30px; white-space: nowrap; border: none; padding: 10px 20px; background-color: #a186be; box-shadow: 5px 5px 0 #55acee; cursor: pointer; transition: transform 0.1s ease-in-out; position: relative; }
        .reset-button:hover { transform: scale(1.2); }
        .reset-button:active { top: 6px; left: 6px; box-shadow: none; background-color: #9475b5; }
    </style>
</head>
<body>
    <div id="board" class="wrapper">
        <div id="currentStatus" class="current-status">
            <img id="currentBeastImg" src="./1.gif" alt="unicorn">
            <p>&nbsp; 's turn</p>
        </div>
        <div class="board">
            <div data-cell></div>
            <div data-cell></div>
            <div data-cell></div>
            <div data-cell></div>
            <div data-cell></div>
            <div data-cell></div>
            <div data-cell></div>
            <div data-cell></div>
            <div data-cell></div>
        </div>
        <div id="gameEndOverlay" class="game-end-overlay">
            <div data-winning-message>
                <p></p>
            </div>
            <div class="btn-container">
                <button id="resetButton">play again</button>
            </div>
        </div>
    </div>
    <script>
        const board = document.getElementById('board');
        const cells = document.querySelectorAll('[data-cell]');
        const currentStatus = document.getElementById('currentStatus');
        const resetButton = document.getElementById('resetButton');
        const gameEndOverlay = document.getElementById('gameEndOverlay');
        const currentBeastStatusImg = document.getElementById('currentBeastImg');
        const winningMessage = document.querySelector('[data-winning-message]');
        const winningMessageText = document.querySelector('[data-winning-message] p');
        const winningMessageImg = document.createElement('img');

        let gameIsLive = true;
        let unicornTurn = true;
        let winner = null;

        const winningCombinations = [
            [0, 1, 2], [3, 4, 5], [6, , ],
            [, , ], [, , ], [, , ],
            [, , ], [, , ]
        ];

          = () => {
            board..();
            board..();
             (unicornTurn) {
                board..();
            }  {
                board..();
            }
        }

          = () => {
            cell..(currentBeast);
        }

          = () => {
            unicornTurn = !unicornTurn;
        }

          = () => {
             (unicornTurn) {
                currentBeastStatusImg. = ;
                currentBeastStatusImg. = ;
            }  {
                currentBeastStatusImg. = ;
                currentBeastStatusImg. = ;
            }
        }

          = () => {
             winningCombinations.( {
                 combination.( {
                     cells[i]..(currentBeast);
                });
            });
        }

          = () => {
             [...cells].( {
                 cell..() || cell..();
            });
        }

          = () => {
            cells.( {
                winningMessageImg.();
                cell..(, );
                cell.(, handleCellClick);
                cell.(, handleCellClick, { :  });
            });
            ();
            gameEndOverlay..();
        }

          = () => {
             (draw) {
                winningMessageText. = ;
            }  {
                winningMessageImg. = unicornTurn ?  : ;
                winningMessageImg. = unicornTurn ?  : ;
                winningMessage.(winningMessageImg, winningMessageText);
                winningMessageText. = ;
            }
            gameEndOverlay..();
        }

          = () => {
             cell = e.;
             currentBeast = unicornTurn ?  : ;
            (cell, currentBeast);
             ((currentBeast)) {
                ();
            }   (()) {
                ();
            }  {
                ();
                ();
                ();
            }
        }

        resetButton.(, startGame);
        ();
    </script>
</body>
</html>

注意：运行前请确保 1.gif 和 2.gif 图片文件存在于同一目录下。