使用JavaScript复制元素(及其样式)

function copyElement(element) {
  const newElement = element.cloneNode(true);
  const style = window.getComputedStyle(element);
  for (const key in style) {
    if (style.hasOwnProperty(key)) {
      newElement.style[key] = style[key];
    }
  }
  return newElement;
}

const elementToCopy = document.querySelector('#elementToCopy');
const copiedElement = copyElement(elementToCopy);
document.body.appendChild(copiedElement);