JavaScript深度克隆：原理、实现与优化

function basicDeepClone(obj) {
  // 1. 处理基本数据类型和null
  if (obj === null || typeof obj !== 'object') {
    return obj;
  }

  let clone;
  // 2. 根据类型创建新的容器：对象或数组
  if (Array.isArray(obj)) {
    clone = [];
  } else {
    clone = {};
  }

  // 3. 递归克隆所有属性/元素
  for (let key in obj) {
    // 确保只处理对象自身的属性，而不是原型链上的属性
    if (Object.prototype.hasOwnProperty.call(obj, key)) {
      clone[key] = basicDeepClone(obj[key]);
    }
  }

  return clone;
}

// 示例
const original = {
  name: 'Alice',
  details: {
    age: 30,
    hobbies: ['reading', 'coding'],
    address: {
      city: 'New York'
    }
  },
  isActive: true
};

const cloned = basicDeepClone(original);

console.log('Original:', original);
console.log('Cloned:', cloned);
console.log('Original !== Cloned:', original !== cloned); // true
console.log('Original.details !== Cloned.details:', original.details !== cloned.details); // true
console.log('Original.details.hobbies !== Cloned.details.hobbies:', original.details.hobbies !== cloned.details.hobbies); // true

// 修改克隆对象，原始对象不受影响
cloned.name = 'Bob';
cloned.details.age = 31;
cloned.details.hobbies.push('hiking');
cloned.details.address.city = 'London';

console.log('\nAfter modification:');
console.log('Original:', original);
console.log('Cloned:', cloned);

function advancedDeepClone(obj, hash = new WeakMap()) {
  // 1. 处理基本数据类型、null 和非对象值
  if (obj === null || typeof obj !== 'object') {
    return obj