离开考试页面即停止心跳重试

src/features/OnlineExam/Examing/RemainTime.vue

@@ -67,12 +67,16 @@ export default {
           });
           return;
         }
-        setTimeout(() => this.getRemainTimeFromServer(), 10 * 1000);
+        this.retryHeartbeatTimeout = setTimeout(
+          () => this.getRemainTimeFromServer(),
+          10 * 1000
+        );
       }
     },
     clearIntervals() {
       clearInterval(this.heartbeatInterval);
       clearInterval(this.remainTimeInterval);
+      clearTimeout(this.retryHeartbeatTimeout);
     }
   },
   computed: {