获取JS创建的元素的Id/名称

var element = document.createElement('div');
element.id = 'myElement';
document.body.appendChild(element);

var myElement = document.getElementById('myElement');
console.log(myElement);

var element = document.createElement('div');
element.classList.add('myElement');
document.body.appendChild(element);

var myElement = document.querySelector('.myElement');
console.log(myElement);

var element = document.createElement('div');
element.setAttribute('data-name', 'myElement');
document.body.appendChild(element);

var myElement = document.querySelectorAll('[data-name="myElement"]');
console.log(myElement);