数组的数组中每列的最小元素

let matrix = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9]
];

function findMinInColumns(matrix) {
  let minValues = [];
  for (let col = 0; col < matrix[0].length; col++) {
    let min = matrix[0][col];
    for (let row = 1; row < matrix.length; row++) {
      if (matrix[row][col] < min) {
        min = matrix[row][col];
      }
    }
    minValues.push(min);
  }
  return minValues;
}

let matrix = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9]
];

console.log(findMinInColumns(matrix)); // 输出: [1, 2, 3]