const deepCopy = (obj) => {
  if (typeof obj !== 'object' || obj === null) {
    return obj;
  }
   let copy = Array.isArray(obj) ? [] : {};
   for (let key in obj) {
    if (obj.hasOwnProperty(key)) {
      copy[key] = deepCopy(obj[key]);
    }
  }
   return copy;
};
 // 使用示例
const originalObj = { name: 'John', age: 30, hobbies: ['reading', 'coding'] };
const copiedObj = deepCopy(originalObj);