矩阵旋转，可用在俄罗斯方块变换方块形状上

rotateMatrix.js

const rotate = function (matrix, direction) {
  for (let y = 0; y < matrix.length; ++y) {
    for (let x = 0; x < y; ++x) {
      [matrix[x][y], matrix[y][x]] = [matrix[y][x], matrix[x][y]];
    }
  }
  if (direction === 'clockWise') {
    // 顺时针旋转
    matrix.forEach((row) => row.reverse());
  } else {
    // 逆时针旋转
    matrix.reverse();
  }
};