如何循环此JSON字符串以获取某个键的结果？

import json

def find_key(json_obj, target_key):
    result = []
    
    if isinstance(json_obj, dict):  # 如果是字典类型
        for key, value in json_obj.items():
            if key == target_key:
                result.append(value)
            else:
                result.extend(find_key(value, target_key))  # 递归调用，继续查找子节点
    elif isinstance(json_obj, list):  # 如果是列表类型
        for item in json_obj:
            result.extend(find_key(item, target_key))  # 递归调用，继续查找子节点
    
    return result

# 示例的JSON字符串
json_str = '''
{
  "name": "John",
  "age": 30,
  "pets": [
    {"type": "dog", "name": "Max"},
    {"type": "cat", "name": "Misty"},
    {"type": "dog", "name": "Rocky"}
  ]
}
'''

# 解析JSON字符串为Python对象
json_obj = json.loads(json_str)

# 循环查找键为"type"的结果
results = find_key(json_obj, "type")
print(results)

['dog', 'cat', 'dog']