dumi-theme-antd-style/dist/components/LazyLoad/utils.js

dumi-theme-antd-style 是为 dumi2 打造的一款文档站主题包，提供了更加美观、易用的研发与阅读体验

var style = function style(element, prop) {
  return typeof getComputedStyle !== 'undefined' ? getComputedStyle(element, null).getPropertyValue(prop) : element.style.getPropertyValue(prop);
};
var overflow = function overflow(element) {
  return style(element, 'overflow') + style(element, 'overflow-y') + style(element, 'overflow-x');
};
export default (function (element) {
  if (!(element instanceof HTMLElement)) {
    return window;
  }
  var parent = element;
  while (parent) {
    if (parent === document.body || parent === document.documentElement) {
      break;
    }
    if (!parent.parentNode) {
      break;
    }
    if (/(scroll|auto)/.test(overflow(parent))) {
      return parent;
    }
    parent = parent.parentNode;
  }
  return window;
});