如何克隆javascript ES6类实例

class Example {
  constructor(name, age) {
    this.name = name;
    this.age = age;
    this.details = { city: 'New York' };
  }
}

const original = new Example('Alice', 30);
const shallowClone = Object.assign({}, original);

// 修改克隆对象的属性
shallowClone.name = 'Bob';
shallowClone.details.city = 'Los Angeles';

console.log(original.name); // Alice
console.log(shallowClone.name); // Bob
console.log(original.details.city); // Los Angeles (因为是浅克隆，所以原始对象的details也被修改了)

function deepClone(obj) {
  if (obj === null || typeof obj !== 'object') return obj;
  const clone = Array.isArray(obj) ? [] : {};
  for (let key in obj) {
    if (obj.hasOwnProperty(key)) {
      clone[key] = deepClone(obj[key]);
    }
  }
  return clone;
}

const original = new Example('Alice', 30);
const deepClone = deepClone(original);

// 修改克隆对象的属性
deepClone.name = 'Bob';
deepClone.details.city = 'Los Angeles';

console.log(original.name); // Alice
console.log(deepClone.name); // Bob
console.log(original.details.city); // New York (因为是深克隆，所以原始对象的details没有被修改)

function deepClone(obj, hash = new WeakMap()) {
  if (obj === null || typeof obj !== 'object') return obj;
  if (hash.has(obj)) return hash.get(obj); // 处理循环引用
  const clone = Array.isArray(obj) ? [] : {};
  hash.set(obj, clone);
  for (let key in obj) {
    if (obj.hasOwnProperty(key)) {
      clone[key] = deepClone(obj[key], hash);
    }
  }
  return clone;
}