rest_framework中APIView、GenericAPIView、5个视图扩展类、9个子类视图、ModelViewSet、ViewSet、ViewSetMixin的继承顺序
APIView（重写了as_view、局部取消了csrf认证， 继承View）
ViewSetMixin（重写了as_view，局部取消了csrf认证，继承object）
GenericAPIView（queryset属性、serializer_class属性，继承APIView）
5个视图扩展类（均继承object）
1）ListModelMixin：lsit查询多条
2）CreateModelMixin：create新增一条
3）UpdateModelMixin：update修改一条
4）RetrieveModelMixin：retrieve查询一条
5）DestroyModelMixin：destroy删除一条
9个子类视图（均继承GenericAPIView）
1）ListAPIView：查所有，继承GenericAPIView、ListModelMixin
2）CreateAPIView：新增一条，继承GenericAPIView、CreateModelMixin
3）RetrieveAPIView：查一条，继承GenericAPIView、RetrieveModelMixin
4）UpdateAPIView：修改一条，继承GenericAPIView、UpdateModelMixin
5）DestroyAPIView：删一条，继承GenericAPIView、DestroyModelMixin
6）ListCreateAPIView：查所有、新增一条，继承GenericAPIView、ListModelMixin、CreateModelMixin
7）RetrieveDestroyAPIView：查一条、删一条，继承GenericAPIView、RetrieveModelMixin、DestroyModelMixin
8）RetrieveUpdateAPIView：查一条、改一条，继承GenericAPIView、RetrieveModelMixin、UpdateModelMixin
9）RetrieveUpdateDestroyAPIView：查一条、改一条、删一条，继承GenericAPIView、RetrieveModelMixin、UpdateModelMixin、DestroyModelMixin