vue warning duplicate key

src/features/OnlineExam/OnlineExamList.vue

@@ -11,7 +11,7 @@
           <td style="max-width: 200px">操作</td>
         </tr>
 
-        <tr v-for="course in courses" :key="course.courseId">
+        <tr v-for="course in courses" :key="course.examId + course.courseId">
           <td>{{ course.courseName }}</td>
           <td v-if="!isEpcc">{{ course.courseLevel }}</td>
           <td v-if="!isEpcc">{{ course.specialtyName }}</td>