fix -- bug

src/views/learningpath/LevelAddDetail.vue

@@ -523,7 +523,13 @@ const closeDeleteChapter = () => {
 };
 //删除关卡
 const deleteChapter = () => {
-
+  if (routerInfo.value.chapterList.length === 1) {
+    message.warning("至少保留一个关卡");
+    return
+  }
+  routerInfo.value.chapterList.splice(activeIndex.value, 1);
+  activeIndex.value = activeIndex.value-1;
+  deleteChapterModal.value = false;
 };
 
 const getDetail = async () => {