清楚欢迎modal的定时器

src/features/OnlineExam/OnlineExamHome.vue

@@ -54,12 +54,16 @@ export default {
                 </div>
               </div>
             </div>
-          )
+          ),
+          onOk: () => {
+            clearInterval(this.interval);
+          }
         });
         this.interval = setInterval(() => {
           this.autoCloseModal--;
           if (this.autoCloseModal <= 0) {
             this.$Modal.remove();
+            clearInterval(this.interval);
           }
         }, 1000);
       }