如何检查某个元素是否仍然存在于 DOM 中？

Question

如何检查某个元素是否仍然存在于 DOM 中？

<div id="parent">
  ...
  <div class="my-class"></div>
</div>

let parent = document.getElementById('parent');
let myElement = parent.getElementsByClassName('my-class')[0];
parent.remove();

function stillExists(element) {
   // check if element still exists in DOM
}

stillExists(myElement) // should be false

Answer 1

简单地做

document.contains(myElement)