udpate

src/components/studyStudent.vue

@@ -5251,8 +5251,8 @@ export default {
           this.selectSWorks();
           let _this = this;
           if (_this.timer) {
-            clearInterval(this.timer);
-            this.timer = null;
+            clearInterval(_this.timer);
+            _this.timer = null;
           }
           _this.timer = setInterval(function () {
             _this.selectSWorks();