JavaScript DOM:在容器中查找元素索引

function getElementIndex(element, container) {
  const children = container.children;
  let index = 0;
  let found = false;

  while (index< children.length && !found) {
    if (children[index] === element) {
      found = true;
    } else {
      index++;
    }
  }

  if (found) {
    return index;
  } else {
    return -1;
  }
}

const element = document.querySelector('#myElement');
const container = document.querySelector('#myContainer');
const index = getElementIndex(element, container);

console.log('Element index:', index);