chore: fix snapshot

Tencent · Jun 9, 2023 · b889294 · b889294
1 parent d31d24b
commit b889294
Showing 1 changed file with 15 additions and 13 deletions.
diff --git a/src/back-top/back-top.tsx b/src/back-top/back-top.tsx
@@ -81,20 +81,22 @@ export default defineComponent({
         return;
       }
       let scrollDOM: HTMLElement;
-      if (containerRef.value.scrollTop === undefined) {
-        scrollDOM = document.documentElement;
-      } else {
-        scrollDOM = containerRef.value;
-      }
-      containerRef.value.onscroll = () => {
-        const { scrollTop } = scrollDOM;
-        if (scrollTop >= visibleHeight) {
-          visible.value = true;
+      if (containerRef.value) {
+        if (containerRef.value.scrollTop === undefined) {
+          scrollDOM = document.documentElement;
+        } else {
+          scrollDOM = containerRef.value;
         }
-        if (scrollTop < visibleHeight && visible.value) {
-          visible.value = false;
-        }
-      };
+        containerRef.value.onscroll = () => {
+          const { scrollTop } = scrollDOM;
+          if (scrollTop >= visibleHeight) {
+            visible.value = true;
+          }
+          if (scrollTop < visibleHeight && visible.value) {
+            visible.value = false;
+          }
+        };
+      }
     });
 
     onBeforeUnmount(() => {