页面修改

src/components/course/othercourse-form.vue

@@ -12,7 +12,7 @@
           <div class="col">
             <q-select dense standout behavior="menu" filled v-model="selectCourse" :options="courseOptions"
               @filter="filterCourseFn" input-debounce="0" use-input option-label="CourseName" option-value="CourseId"
-              emit-value map-options placeholder="请选择" clearable />
+              emit-value map-options :placeholder="!selectCourse ? '请选择关联课程' : ''" clearable />
           </div>
           <div class="q-ml-md">
             <q-btn color="primary" label="添加" @click="addCourse"></q-btn>