js获得object的id

const obj = {
  id: '12345',
  name: 'Example Object'
};

const id = obj.id;
console.log(id); // 输出: '12345'

const id = obj['id'];
console.log(id); // 输出: '12345'

// 假设HTML中有一个元素 <div id="myElement"></div>
const element = document.getElementById('myElement');
const id = element.id;
console.log(id); // 输出: 'myElement'

const objectsArray = [
  { id: '1', name: 'Object 1' },
  { id: '2', name: 'Object 2' },
  { id: '3', name: 'Object 3' }
];

const ids = objectsArray.map(obj => obj.id);
console.log(ids); // 输出: ['1', '2', '3']

// 定义一个对象
const user = {
  id: 'user123',
  username: 'johndoe',
  email: 'john@example.com'
};

// 获取对象的id属性
const userId = user.id;
console.log(`User ID: ${userId}`); // 输出: User ID: user123

// 获取DOM元素的id属性
const button = document.querySelector('button');
if (button) {
  console.log(`Button ID: ${button.id}`); // 假设button元素有一个id属性
} else {
  console.log('Button element not found');
}