js对象的定义

const person = {
  name: 'Alice',
  age: 25,
  greet: function() {
    console.log(`Hello, my name is ${this.name}`);
  }
};

person.greet(); // 输出: Hello, my name is Alice

function Person(name, age) {
  this.name = name;
  this.age = age;
  this.greet = function() {
    console.log(`Hello, my name is ${this.name}`);
  };
}

const person = new Person('Bob', 30);
person.greet(); // 输出: Hello, my name is Bob

const proto = {
  greet: function() {
    console.log(`Hello, my name is ${this.name}`);
  }
};

const person = Object.create(proto);
person.name = 'Charlie';
person.age = 35;
person.greet(); // 输出: Hello, my name is Charlie

const obj = {
  1: 'one',
  true: 'yes',
  '': 'empty string'
};

console.log(obj['1']); // 输出: one
console.log(obj[true]); // 输出: yes
console.log(obj['']); // 输出: empty string

const person = {};
person.name = 'David'; // 动态添加属性
person.greet = function() { // 动态添加方法
  console.log(`Hello, my name is ${this.name}`);
};

person.greet(); // 输出: Hello, my name is David

const person = {
  name: 'Eve',
  age: 28
};

delete person.age;
console.log(person); // 输出: { name: 'Eve' }