在JavaScript中有没有通过数据属性实现的方法？

const obj = {
  firstName: 'John',
  lastName: 'Doe',
  
  get fullName() {
    return this.firstName + ' ' + this.lastName;
  },
  
  set fullName(name) {
    const parts = name.split(' ');
    this.firstName = parts[0];
    this.lastName = parts[1];
  }
};

console.log(obj.fullName); // 输出：John Doe

obj.fullName = 'Jane Smith';
console.log(obj.firstName); // 输出：Jane
console.log(obj.lastName); // 输出：Smith