班级改变的时候 清空选择学生

src/views/prepare-lessons/components/lesson-main/train/assign-homework.tsx

@@ -371,6 +371,7 @@ export default defineComponent({
               clearable
               onUpdate:value={() => {
                 forms.classGroupId = null;
+                forms.studentList = []
                 getClassList();
               }}
             />