Squashed commit of the following:

commit 2849d2d18d83c0bc1e362625de90dfeb05e4d91a
Author: skyblued <806020149@qq.com>
Date:   Mon Aug 15 18:40:11 2022 +0800

    视频课声部

commit 78e0dee976bbd96f4ecd2b26685356f60ed8e60f
Author: skyblued <806020149@qq.com>
Date:   Mon Aug 15 18:28:04 2022 +0800

    视频课修改

src/teacher/video-class/class-info.tsx

@@ -126,6 +126,7 @@ export default defineComponent({
               }}
               rules={[{ required: true, message: '请选择课程声部' }]}
               placeholder="请选择课程声部"
+              disabled={createState.groupId ? true : false}
             />
           </ColField>
         </ColFieldGroup>