js 获取数组的深度

js 获取数组的深度
通过递归的方法

getDepth(arr, depth) {
  var flag = false;
  var temp = [];
  for (let i = 0; i < arr.length; i++) {
    if (arr[i].children instanceof Array) { // 判断是否是数组
      for (let j = 0; j < arr[i].children.length; j++) {
        temp.push(arr[i].children[j]); // 解析出arr下第一层
      }
      flag = true;
    }
  }
  if (flag) { // 如果还有数组，则继续解析，直到最后一层有不为数组为止
    depth++;
    return this.getDepth(temp, depth); 
  } else {
    return depth;
  }
}

数据例子：

const arr = [
  {
    "id": 4,
    "name": "沙发",
    "children": [
      {
        "id": 10,
        "name": "多人沙发",
        "children": [
          {
            "id": 21,
            "name": "双人沙发（一字）",
            "children": [],
            "content": []
          },
          {
            "id": 22,
            "name": "三人沙发（一字）",
            "children": [],
            "content": []
          },
          {
            "id": 23,
            "name": "四人沙发（一字）",
            "children": [],
            "content": []
          },
          {
            "id": 24,
            "name": "L型转角沙发",
            "children": [],
            "content": []
          },
          {
            "id": 25,
            "name": "斜角沙发",
            "children": [],
            "content": []
          },
          {
            "id": 26,
            "name": "U型转角沙发",
            "children": [],
            "content": []
          },
          {
            "id": 27,
            "name": "弧形沙发",
            "children": [],
            "content": []
          }
        ]
      },
      {
        "id": 11,
        "name": "单人沙发",
        "children": [
          {
            "id": 28,
            "name": "带扶手沙发",
            "children": [],
            "content": []
          }
        ]
      },
      {
        "id": 12,
        "name": "贵妃榻",
        "children": [
          {
            "id": 29,
            "name": "贵妃榻",
            "children": [],
            "content": []
          }
        ]
      },
      {
        "id": 13,
        "name": "沙发床",
        "children": [
          {
            "id": 30,
            "name": "沙发床",
            "children": [],
            "content": []
          }
        ]
      }
    ]
  },
  {
    "id": 14,
    "name": "沙发",
    "children": [
      {
        "id": 15,
        "name": "多人沙发",
        "children": [],
        "content": []
      },
      {
        "id": 16,
        "name": "单人沙发",
        "children": [],
        "content": []
      },
      {
        "id": 17,
        "name": "L型沙发",
        "children": [],
        "content": []
      },
      {
        "id": 18,
        "name": "懒人沙发",
        "children": [],
        "content": []
      },
      {
        "id": 19,
        "name": "沙发床",
        "children": [],
        "content": []
      },
      {
        "id": 20,
        "name": "儿童沙发",
        "children": [],
        "content": []
      }
    ]
  },
  {
    "id": 31,
    "name": "沙发",
    "children": [
      {
        "id": 32,
        "name": "沙发",
        "children": [],
        "content": []
      },
      {
        "id": 33,
        "name": "沙发",
        "children": [],
        "content": []
      },
      {
        "id": 34,
        "name": "沙发",
        "children": [],
        "content": []
      },
      {
        "id": 35,
        "name": "沙发",
        "children": [],
        "content": []
      }
    ]
  },
  {
    "id": 36,
    "name": "沙发",
    "children": [
      {
        "id": 40,
        "name": "沙发",
        "children": [],
        "content": []
      },
      {
        "id": 41,
        "name": "沙发",
        "children": [],
        "content": []
      }
    ]
  },
  {
    "id": 37,
    "name": "沙发",
    "children": [
      {
        "id": 42,
        "name": "沙发",
        "children": [
          {
            "id": 43,
            "name": "沙发",
            "children": [],
            "content": []
          }
        ]
      },
      {
        "id": 44,
        "name": "沙发",
        "children": []
      },
      {
        "id": 45,
        "name": "沙发",
        "children": []
      },
      {
        "id": 46,
        "name": "沙发",
        "children": []
      }
    ]
  },
  {
    "id": 38,
    "name": "沙发",
    "children": [],
    "content": []
  },
  {
    "id": 39,
    "name": "沙发",
    "children": [],
    "content": []
  }
]

调用getDepth(arr, 1)取得数组深度为：3