js 怎么改变对象的可以吗

let obj = {
  name: 'Alice',
  age: 25
};

// 使用点符号改变属性值
obj.name = 'Bob';

// 使用方括号改变属性值
obj['age'] = 30;

console.log(obj); // 输出: { name: 'Bob', age: 30 }

obj.gender = 'male';
console.log(obj); // 输出: { name: 'Bob', age: 30, gender: 'male' }

delete obj.age;
console.log(obj); // 输出: { name: 'Bob', gender: 'male' }

obj.sayHello = function() {
  console.log('Hello, my name is ' + this.name);
};

obj.sayHello(); // 输出: Hello, my name is Bob

let person = {
  firstName: 'John',
  lastName: 'Doe',
  getFullName: function() {
    return this.firstName + ' ' + this.lastName;
  }
};

console.log(person.getFullName()); // 输出: John Doe

// 修改属性
person.firstName = 'Jane';
console.log(person.getFullName()); // 输出: Jane Doe

// 添加新属性
person.age = 28;
console.log(person); // 输出: { firstName: 'Jane', lastName: 'Doe', getFullName: [Function: getFullName], age: 28 }

// 删除属性
delete person.age;
console.log(person); // 输出: { firstName: 'Jane', lastName: 'Doe', getFullName: [Function: getFullName] }