From 802ecf6e9e80cd43f94217e52dae8ed7048aa2b1 Mon Sep 17 00:00:00 2001
From: lijianan <574980606@qq.com>
Date: Fri, 23 Sep 2022 16:11:52 +0800
Subject: [PATCH] style: code optimization (#37718)

---
 components/back-top/index.tsx | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/components/back-top/index.tsx b/components/back-top/index.tsx
index 81093f2549..99651d0d87 100644
--- a/components/back-top/index.tsx
+++ b/components/back-top/index.tsx
@@ -63,9 +63,9 @@ const BackTop: React.FC<BackTopProps> = props => {
 
   const handleScroll = throttleByAnimationFrame(
     (e: React.UIEvent<HTMLElement> | { target: any }) => {
-      const { visibilityHeight } = props;
+      const { visibilityHeight = 400 } = props;
       const scrollTop = getScroll(e.target, true);
-      setVisible(scrollTop > visibilityHeight!);
+      setVisible(scrollTop > visibilityHeight);
     },
   );
 
@@ -131,8 +131,4 @@ const BackTop: React.FC<BackTopProps> = props => {
   );
 };
 
-BackTop.defaultProps = {
-  visibilityHeight: 400,
-};
-
 export default React.memo(BackTop);