如何在Javascript中制作对象的深层副本

const obj = { name: 'John', age: 30, address: { city: 'New York', country: 'USA' } };
const clone = { ...obj };

const obj = { name: 'John', age: 30, address: { city: 'New York', country: 'USA' } };
const clone = JSON.parse(JSON.stringify(obj));

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

const obj = { name: 'John', age: 30, address: { city: 'New York', country: 'USA' } };
const clone = deepClone(obj);