如何在HTML iFrame中检测滚动条的存在(使用Javascript)？

function hasScrollbar(element) {
  return element.scrollHeight > element.clientHeight;
}

const iframe = document.querySelector('iframe');
const iframeContent = iframe.contentDocument || iframe.contentWindow.document;

iframe.addEventListener('load', () => {
  const iframeBody = iframeContent.querySelector('body');
  const hasVerticalScrollbar = hasScrollbar(iframeBody);
  const hasHorizontalScrollbar = hasScrollbar(iframeBody);

  console.log('垂直滚动条：', hasVerticalScrollbar);
  console.log('水平滚动条：', hasHorizontalScrollbar);
});