diff --git a/src/components/Discover/Map/Filter/ActAndSeq.vue b/src/components/Discover/Map/Filter/ActAndSeq.vue
index d231f1e..d4fe548 100644
--- a/src/components/Discover/Map/Filter/ActAndSeq.vue
+++ b/src/components/Discover/Map/Filter/ActAndSeq.vue
@@ -148,7 +148,9 @@ export default {
       // 拖曳結束要顯示箭頭，但最後一個不用
       const lastChild = evt.item.lastChild;
       const listIndex = this.listSequence.length - 1
-      evt.oldIndex !== listIndex ? lastChild.style.display = '' : null;
+      if (evt.oldIndex !== listIndex) {
+          lastChild.style.display = '';
+      }
       // reset: 拖曳最後一個元素時，倒數第二的元素的箭頭要隱藏
       this.lastItemIndex = null;
     },