如何过滤和检索嵌套的JSON数据

function filterAndSearchJSON(jsonData, filter) {
  if (typeof jsonData === 'object') {
    if (Array.isArray(jsonData)) {
      // 处理数组
      const filteredArray = [];
      for (let i = 0; i < jsonData.length; i++) {
        const filteredItem = filterAndSearchJSON(jsonData[i], filter);
        if (filteredItem !== null) {
          filteredArray.push(filteredItem);
        }
      }
      return filteredArray;
    } else {
      // 处理对象
      const filteredObject = {};
      for (const key in jsonData) {
        if (jsonData.hasOwnProperty(key)) {
          const filteredValue = filterAndSearchJSON(jsonData[key], filter);
          if (filteredValue !== null) {
            filteredObject[key] = filteredValue;
          }
        }
      }
      return filteredObject;
    }
  } else {
    // 处理基本数据类型
    if (filter(jsonData)) {
      return jsonData;
    } else {
      return null;
    }
  }
}

// 示例JSON数据
const jsonData = {
  "name": "John",
  "age": 30,
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "country": "USA"
  },
  "friends": [
    {
      "name": "Alice",
      "age": 28
    },
    {
      "name": "Bob",
      "age": 32
    }
  ]
};

// 示例过滤条件：筛选年龄大于等于30的数据
function ageFilter(value) {
  return typeof value === 'number' && value >= 30;
}

// 过滤和检索JSON数据
const filteredData = filterAndSearchJSON(jsonData, ageFilter);
console.log(filteredData);