2048游戏js代码

const size = 4;
let board = createBoard(size);

function createBoard(size) {
    let board = [];
    for (let i = 0; i < size; i++) {
        board[i] = [];
        for (let j = 0; j < size; j++) {
            board[i][j] = 0;
        }
    }
    addRandomTile(board);
    addRandomTile(board);
    return board;
}

function addRandomTile(board) {
    const emptyCells = [];
    for (let i = 0; i < size; i++) {
        for (let j = 0; j < size; j++) {
            if (board[i][j] === 0) {
                emptyCells.push({ x: i, y: j });
            }
        }
    }
    if (emptyCells.length > 0) {
        const cell = emptyCells[Math.floor(Math.random() * emptyCells.length)];
        board[cell.x][cell.y] = Math.random() < 0.9 ? 2 : 4;
    }
}

function moveLeft(board) {
    let moved = false;
    for (let i = 0; i < size; i++) {
        let row = board[i].filter(x => x !== 0);
        for (let j = 0; j < row.length - 1; j++) {
            if (row[j] === row[j + 1]) {
                row[j] *= 2;
                row[j + 1] = 0;
                moved = true;
            }
        }
        row = row.filter(x => x !== 0);
        while (row.length < size) {
            row.push(0);
        }
        board[i] = row;
    }
    return moved;
}

// Similar functions for moveRight, moveUp, moveDown

document.addEventListener('keydown', event => {
    switch (event.key) {
        case 'ArrowLeft':
            if (moveLeft(board)) {
                addRandomTile(board);
                renderBoard(board);
                checkGameOver(board);
            }
            break;
        // Handle other arrow keys
    }
});

function renderBoard(board) {
    // Code to update the DOM based on the board state
}

function checkGameOver(board) {
    // Check if there are any valid moves left
}