如何获取嵌套json对象数组中孩子Id的直接父id？

function getDirectParentIds(jsonArray, childId) {
  var parentIds = [];

  function findParentIds(obj, childId) {
    if (obj.children) {
      for (var i = 0; i < obj.children.length; i++) {
        if (obj.children[i].Id === childId) {
          parentIds.push(obj.Id);
        } else {
          findParentIds(obj.children[i], childId);
        }
      }
    }
  }

  for (var i = 0; i < jsonArray.length; i++) {
    findParentIds(jsonArray[i], childId);
  }

  return parentIds;
}

// 示例用法
var jsonArray = [
  {
    "Id": 1,
    "children": [
      {
        "Id": 2,
        "children": [
          {
            "Id": 3
          },
          {
            "Id": 4
          }
        ]
      },
      {
        "Id": 5
      }
    ]
  },
  {
    "Id": 6,
    "children": [
      {
        "Id": 7
      },
      {
        "Id": 8
      }
    ]
  }
];

var childId = 4;
var parentIds = getDirectParentIds(jsonArray, childId);
console.log(parentIds); // 输出 [2, 1]