diff --git a/src/main/ets/view/SafeView.ets b/src/main/ets/view/SafeView.ets
index f1d2e78..e30b727 100644
--- a/src/main/ets/view/SafeView.ets
+++ b/src/main/ets/view/SafeView.ets
@@ -39,7 +39,7 @@ export struct SafeView {
    */
   @Prop showBadgeRight: boolean;
   // 设置返回按钮事件，如果hideBack为true，该事件无效
-  onBackEvent?: () => void = undefined
+  onBackEvent?: () => void
   // 设置返回按钮事件
   @Prop onClickLeft?: TitleBarBtn
   @Prop onClickRight?: TitleBarBtn