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src/views/teamDetail/components/studentList.vue

@@ -1444,7 +1444,7 @@ export default {
               this.maskForm.parentName = res.data.parentsName;
               this.maskForm.course = res.data.currentClass;
               this.maskForm.startClass = res.data.currentGrade;
-              this.maskForm.currentGradeNum = (res.data.currentGradeNum) + '';
+              this.maskForm.currentGradeNum = res.data.currentGradeNum ? (res.data.currentGradeNum) + '' : null;
               this.maskForm.phone = val;
               this.maskForm.timer = res.data.birthdate;
             }