如何从二维数组中获取每列的最大值+最大值的索引

function getColumnMaxValues(arr) {
  var result = [];
  for (var col = 0; col < arr[0].length; col++) {
    var max_value = arr[0][col];
    var max_index = 0;
    for (var row = 1; row < arr.length; row++) {
      if (arr[row][col] > max_value) {
        max_value = arr[row][col];
        max_index = row;
      }
    }
    result.push({ max_value: max_value, max_index: max_index });
  }
  return result;
}

// 示例用法
var arr = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9]
];
var result = getColumnMaxValues(arr);
console.log(result);

[
  { max_value: 7, max_index: 2 },
  { max_value: 8, max_index: 2 },
  { max_value: 9, max_index: 2 }
]