修改

src/views/choose-homework/classroom-detail/index.tsx

@@ -415,7 +415,7 @@ export default defineComponent({
                 const ids = getKnowledgeMaterialIds(data.list);
                 if (state.max !== -1) {
                   if (ids.length > state.max) {
-                    showToast(`练习组还可以添加${state.max}练习`);
+                    showToast(`当前练习组只可添加${state.max}条练习`);
                     return;
                   }
                 }

src/views/exercise-after-class/index.tsx

@@ -327,8 +327,12 @@ export default defineComponent({
       data.visiableStatus = false;
     };
     const dialogCancel = () => {
-      data.trainings[data.itemIndex].currentTime = 0;
-      data.trainings[data.itemIndex].videoEle.currentTime(0);
+      try {
+        data.trainings[data.itemIndex].currentTime = 0;
+        data.trainings[data.itemIndex]?.videoEle?.currentTime(0);
+      } catch {
+        //
+      }
       data.visiableStatus = false;
     };