From 04ad7236e4ff73c29643b7bef363b6c3a9b9daca Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=81=8F=E5=8F=B3?= <afc163@gmail.com>
Date: Fri, 15 May 2020 23:16:49 +0800
Subject: [PATCH] :bug: Fix Backtop cannot work in Chrome iframe (#24194)

close #24192
---
 components/_util/scrollTo.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/components/_util/scrollTo.ts b/components/_util/scrollTo.ts
index 1c79cc93cbf1..b3648407d307 100644
--- a/components/_util/scrollTo.ts
+++ b/components/_util/scrollTo.ts
@@ -24,8 +24,8 @@ export default function scrollTo(y: number, options: ScrollToOptions = {}) {
     const nextScrollTop = easeInOutCubic(time > duration ? duration : time, scrollTop, y, duration);
     if (isWindow(container)) {
       (container as Window).scrollTo(window.pageXOffset, nextScrollTop);
-    } else if (container instanceof Document) {
-      container.documentElement.scrollTop = nextScrollTop;
+    } else if (container instanceof HTMLDocument || container.constructor.name === 'HTMLDocument') {
+      (container as HTMLDocument).documentElement.scrollTop = nextScrollTop;
     } else {
       (container as HTMLElement).scrollTop = nextScrollTop;
     }