基于条件从JSON获取值

// 假设有以下JSON数据
const data = {
  "name": "John",
  "age": 30,
  "address": {
    "street": "123 ABC Street",
    "city": "XYZ City"
  }
};

// 从JSON中获取值的函数
function getValueFromJSON(json, condition) {
  const keys = Object.keys(json);
  for (let i = 0; i < keys.length; i++) {
    const key = keys[i];
    const value = json[key];
    
    if (key === condition) {
      return value;
    }
    
    if (typeof value === 'object') {
      const result = getValueFromJSON(value, condition);
      if (result !== undefined) {
        return result;
      }
    }
  }
  
  return undefined;
}

// 示例用法
const result = getValueFromJSON(data, 'city');
console.log(result); // 输出：XYZ City