antd-mobile/2x/es/utils/get-scroll-parent.js

<img src="https://gw.alipayobjects.com/mdn/rms_ee68a8/afts/img/A*hjjDS5Yy-ooAAAAAAAAAAAAAARQnAQ" alt="logo" width="100%" />

import { canUseDom } from './can-use-dom';
const overflowScrollReg = /scroll|auto|overlay/i;
const defaultRoot = canUseDom ? window : undefined;

function isElement(node) {
  const ELEMENT_NODE_TYPE = 1;
  return node.nodeType === ELEMENT_NODE_TYPE;
} // https://github.com/youzan/vant/issues/3823


export function getScrollParent(el, root = defaultRoot) {
  let node = el;

  while (node && node !== root && isElement(node)) {
    const {
      overflowY
    } = window.getComputedStyle(node);

    if (overflowScrollReg.test(overflowY)) {
      return node;
    }

    node = node.parentNode;
  }

  return root;
}