摄像头默认关闭

client/mobile/pages_classroom.tsx

@@ -149,7 +149,7 @@ export const ClassroomPage = () => {
 
   // 状态管理
   const [userId, setUserId] = useState<string>('');
-  const [isCameraOn, setIsCameraOn] = useState<boolean>(true);
+  const [isCameraOn, setIsCameraOn] = useState<boolean>(false);
   const [className, setClassName] = useState<string>('');
   const [role, setRole] = useState<Role>(Role.Student);
   const [classId, setClassId] = useState<string>('');