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node_modules/vant/es/utils/dom/style.js

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+export function isHidden(el) {
+  var style = window.getComputedStyle(el);
+  var hidden = style.display === 'none'; // offsetParent returns null in the following situations:
+  // 1. The element or its parent element has the display property set to none.
+  // 2. The element has the position property set to fixed
+
+  var parentHidden = el.offsetParent === null && style.position !== 'fixed';
+  return hidden || parentHidden;
+}