1. 以前django做的分页组件当数据量特别大的时候，性能不是很高，有以下三种方式处理：
        a. 记录当前访问页的最后一条数据id，往后取多少条
        b. 最多显示120页
        c. 对页码进行加密(只显示上一页，下一页)

2.rest framework分页
    from rest_framework.pagination import LimitOffsetPagination,PageNumberPagination,CursorPagination

    a. 基于limit offset做分页

        class P1(LimitOffsetPagination):

            max_limit = 3   #每页的最大条数

            default_limit = 2    #每页条数

            limit_query_param = 'limit'

            offset_query_param = 'offset'

        #简单的分页

        class IndexView(views.APIView):

            def get(self,request,*args,**kwargs):

                user_list = models.UserInfo.objects.all()

                p1 = P1()

                page_user_list = p1.paginate_queryset(queryset=user_list, request=request, view=self)

                ser = IndexSerializer(instance=page_user_list, many=True)

                return Response(ser.data) # 不含上一页和下一页，要手动的在url中传参limit和offset来控制第几页

                # return p1.get_paginated_response(ser.data) # 含上一页和下一页

        #在公司中的分页简例

        class IndexView(views.APIView):

            def get(self,request,*args,**kwargs):

                ret = BaseResponse()

                try:

                    user_list = models.UserInfo.objects.all()

                    p1 = P1()

                    page_user_list = p1.paginate_queryset(queryset=user_list,request=request,view=self)

                    ser = IndexSerializer(instance=page_user_list,many=True)

                    ret.data = ser.data

                    ret.next = p1.get_next_link()

                    ret.*** = 看源码自己实现

                except Exception as e:

                    ret.code= 1001

                    ret.error = 'xxxx错误'

                return Response(ret.__dict__)

    b. 基于页码的分页

        class P2(PageNumberPagination):

            # 每页显示的数据条数

            max_page_size = 5

            page_size = 2

            page_size_query_param = 'size'

            # 页码

            page_query_param = 'page'

        #用法和上面是一样的

        class IndexView(views.APIView):

            def get(self,request,*args,**kwargs):

                ret = BaseResponse()

                try:

                    user_list = models.UserInfo.objects.all()

                    p1 = P2()

                    page_user_list = p1.paginate_queryset(queryset=user_list,request=request,view=self)

                    ser = IndexSerializer(instance=page_user_list,many=True)

                    ret.data = ser.data

                    ret.next = p1.get_next_link()

                    ret.*** = 看源码自己实现

                except Exception as e:

                    ret.code= 1001

                    ret.error = 'xxxx错误'

                return Response(ret.__dict__)

    c. 基于Cursor的分页：记录最后一条数据的id，往后取多少条然后再进行加密

        class P3(CursorPagination):

            cursor_query_param = 'cursor'

            page_size = 2

            ordering = 'id'  #排序 也可以写成  -id 

        #用法和上面是一样的

        class IndexView(views.APIView):

            def get(self,request,*args,**kwargs):

                ret = BaseResponse()

                try:

                    user_list = models.UserInfo.objects.all()

                    p1 = P3()

                    page_user_list = p1.paginate_queryset(queryset=user_list,request=request,view=self)

                    ser = IndexSerializer(instance=page_user_list,many=True)

                    ret.data = ser.data

                    ret.next = p1.get_next_link()

                    ret.*** = 看源码自己实现

                except Exception as e:

                    ret.code= 1001

                    ret.error = 'xxxx错误'

                return Response(ret.__dict__)