diff --git a/packages/varlet-ui/src/index-bar/IndexBar.vue b/packages/varlet-ui/src/index-bar/IndexBar.vue
index 3a6a32ec2f2..53ea75ed29f 100644
--- a/packages/varlet-ui/src/index-bar/IndexBar.vue
+++ b/packages/varlet-ui/src/index-bar/IndexBar.vue
@@ -73,10 +73,7 @@ export default defineComponent({
       }
     )
 
-    onSmartMounted(async () => {
-      await setScroller()
-      addScrollerListener()
-    })
+    onSmartMounted(handleScroll)
 
     onBeforeUnmount(removeScrollerListener)
 
@@ -116,6 +113,10 @@ export default defineComponent({
     }
 
     function handleScroll() {
+      if (!scroller) {
+        setupScroller()
+      }
+
       const scrollTop = getScrollTop(scroller!)
       const scrollHeight = scroller === window ? document.body.scrollHeight : (scroller as HTMLElement).scrollHeight
       const offsetTop = getOffsetTop()
@@ -170,17 +171,17 @@ export default defineComponent({
       clickedName.value = ''
     }
 
-    async function setScroller() {
-      await doubleRaf()
+    function setupScroller() {
       scroller = getParentScroller(barEl.value as HTMLElement)
-    }
-
-    function addScrollerListener() {
-      scroller!.addEventListener('scroll', handleScroll)
+      scroller.addEventListener('scroll', handleScroll)
     }
 
     function removeScrollerListener() {
-      scroller!.removeEventListener('scroll', handleScroll)
+      if (!scroller) {
+        return
+      }
+
+      scroller.removeEventListener('scroll', handleScroll)
     }
 
     // expose