bug fix

src/modules/base/components/ModifyExam.vue

@@ -168,9 +168,9 @@ export default {
     },
     categoryChange() {
       if (this.modalForm.category === "MAKEUP") {
-        this.modalForm.examModel === "MODEL2";
+        this.modalForm.examModel = "MODEL2";
       } else {
-        this.modalForm.examModel === "MODEL1";
+        this.modalForm.examModel = "MODEL1";
       }
     },
     async submit() {