如何在连接四中检查对角线

function checkDiagonal(board) {
  const rows = board.length;
  const cols = board[0].length;

  // 检查从左上到右下的对角线
  for (let i = 0; i < rows - 3; i++) {
    for (let j = 0; j < cols - 3; j++) {
      const player = board[i][j];
      if (player !== 0 &&
          player === board[i+1][j+1] &&
          player === board[i+2][j+2] &&
          player === board[i+3][j+3]) {
        return player;
      }
    }
  }

  // 检查从右上到左下的对角线
  for (let i = 0; i < rows - 3; i++) {
    for (let j = 3; j < cols; j++) {
      const player = board[i][j];
      if (player !== 0 &&
          player === board[i+1][j-1] &&
          player === board[i+2][j-2] &&
          player === board[i+3][j-3]) {
        return player;
      }
    }
  }

  return 0; // 没有找到连续的四个相同的棋子
}

// 示例用法
const board = [
  [0, 0, 0, 0, 0, 0, 0],
  [0, 0, 0, 0, 0, 0, 0],
  [0, 0, 0, 0, 0, 0, 0],
  [0, 0, 0, 1, 0, 0, 0],
  [0, 0, 0, 0, 1, 0, 0],
  [0, 0, 0, 0, 0, 1, 0]
];

const winner = checkDiagonal(board);
if (winner !== 0) {
  console.log(`玩家 ${winner} 获胜！`);
} else {
  console.log("没有玩家获胜。");
}