从嵌套的Json对象中获取同级数据

{
  "name": "John",
  "age": 30,
  "address": {
    "street": "123 Main St",
    "city": "Anytown"
  },
  "contacts": [
    {
      "type": "email",
      "value": "john@example.com"
    },
    {
      "type": "phone",
      "value": "123-456-7890"
    }
  ]
}

const data = {
  "name": "John",
  "age": 30,
  "address": {
    "street": "123 Main St",
    "city": "Anytown"
  },
  "contacts": [
    {
      "type": "email",
      "value": "john@example.com"
    },
    {
      "type": "phone",
      "value": "123-456-7890"
    }
  ]
};

console.log(data.name); // 输出: John
console.log(data.address.city); // 输出: Anytown
console.log(data.contacts[0].value); // 输出: john@example.com

function getSameLevelData(obj, targetKey) {
  const result = [];
  for (const key in obj) {
    if (key === targetKey) {
      result.push(obj[key]);
    } else if (typeof obj[key] === 'object' && !Array.isArray(obj[key])) {
      result.push(...getSameLevelData(obj[key], targetKey));
    }
  }
  return result;
}

const data = {
  "name": "John",
  "age": 30,
  "address": {
    "street": "123 Main St",
    "city": "Anytown"
  },
  "contacts": [
    {
      "type": "email",
      "value": "john@example.com"
    },
    {
      "type": "phone",
      "value": "123-456-7890"
    }
  ]
};

console.log(getSameLevelData(data, 'city')); // 输出: ["Anytown"]

if (data.hasOwnProperty('address') && data.address.hasOwnProperty('city')) {
  console.log(data.address.city);
} else {
  console.log('Key not found');
}

function getSameLevelData(obj, targetKey, visited = new Set()) {
  if (visited.has(obj)) return [];
  visited.add(obj);

  const result = [];
  for (const key in obj) {
    if (key === targetKey) {
      result.push(obj[key]);
    } else if (typeof obj[key] === 'object' && !Array.isArray(obj[key])) {
      result.push(...getSameLevelData(obj[key], targetKey, visited));
    }
  }
  return result;
}