js解析object对象

let person = {
  firstName: "John",
  lastName: "Doe",
  age: 30,
  fullName: function() {
    return this.firstName + " " + this.lastName;
  }
};

// 访问属性
console.log(person.firstName); // 输出: John

// 调用方法
console.log(person.fullName()); // 输出: John Doe

// 动态添加属性
person.email = "john.doe@example.com";
console.log(person.email); // 输出: john.doe@example.com

// 动态删除属性
delete person.age;
console.log(person.age); // 输出: undefined

if ('age' in person) {
  console.log(person.age);
} else {
  console.log('Age is not defined.');
}

let person = {
  firstName: "John",
  lastName: "Doe",
  fullName: () => {
    return this.firstName + " " + this.lastName; // 箭头函数中的this指向全局对象
  }
};

// 正确绑定this
let boundFullName = person.fullName.bind(person);
console.log(boundFullName()); // 输出: John Doe