哪里可以做网站的sem是什么职位

1.分页a. 分页 看第n页 每页显示n条数据:b. 分页 在某个位置 向后查看多少条数据c. 加密分页 上一页和下一页本质：查看 记住页码id的最大值和最小值 通过其来准确扫描过去的话 会从id 1到n扫描第一种分页
api下的utils.serializers.pager.py
from rest_framework import serializers
from api import models
class PagerSerialiser(serializers.ModelSerializer):class Meta:model = models.Rolefields = "__all__"url里写
from django.contrib import admin
from api import views
from django.conf.urls import url
urlpatterns = [url(r'^pager1/', views.Pager1View.as_view())
]视图里写
from rest_framework.response import Response
from api.utils.serializers.pager import PagerSerialiser
from rest_framework.pagination import PageNumberPaginationclass MyPageNumberPagination(PageNumberPagination):page_size=2  #默认两个page_size_query_param = 'size'  #传一个size参数 一页显示多少  http://127.0.0.1:8000/pager1/?page=1&size=3max_page_size = 5  #一页显示最大5个page_query_param = 'page'  #页码class Pager1View(APIView):def get(self,request, *args,**kwargs):#获取所有数据roles = models.Role.objects.all()#创建分页对象pg = MyPageNumberPagination()#在数据库中获取分页数据pager_roles = pg.paginate_queryset(queryset=roles, request=request,view=self)print(pager_roles)#对分页数据进行序列化ser = PagerSerialiser(instance=pager_roles, many=True)return pg.get_paginated_response(ser.data)  #返回上一页或者下一页第二种分页 索引值最大最小值分页
视图函数
from django.shortcuts import render,HttpResponse
import json
# Create your views here.
from rest_framework.views import APIView
from rest_framework import serializers
from api import models
class UserInfoserializer(serializers.ModelSerializer):group = serializers.HyperlinkedIdentityField(view_name='gp',lookup_field='group_id',lookup_url_kwarg='pk')class Meta:model = models.UserInfo# fields = '__all__'fields = ['group']depth = 0 #0到3 4层class UserInfoView(APIView):def get(self,request, *arg, **kwargs):users = models.UserInfo.objects.all()ser = UserInfoserializer(instance=users, many=True,context={'request': request})  #必须添加 context = {'request':request}ret = json.dumps(ser.data, ensure_ascii = False)return HttpResponse(ret)class GroupSerializer(serializers.ModelSerializer):class Meta:model = models.UserGroupfields = '__all__'class GroupView(APIView):def get(self,request,*args,**kwargs):pk = kwargs.get('pk')obj = models.UserGroup.objects.filter(pk=pk).first()ser = GroupSerializer(instance=obj, many=False)ret = json.dumps(ser.data,ensure_ascii=False)return HttpResponse(ret)from rest_framework.response import Response
from api.utils.serializers.pager import PagerSerialiser
from rest_framework.pagination import PageNumberPagination,LimitOffsetPaginationclass MyPageNumberPagination(PageNumberPagination):page_size=2  #默认两个page_size_query_param = 'size'  #传一个size参数 一页显示多少  http://127.0.0.1:8000/pager1/?page=1&size=3max_page_size = 5  #一页显示最大5个page_query_param = 'page'  #页码class MyPagenumber2Pagination(LimitOffsetPagination):default_limit = 3limit_query_param = 'limit'  #每页多少条数据offset_query_param = 'offset'  #第几个索引开始max_limit = 5class Pager1View(APIView):def get(self,request, *args,**kwargs):#获取所有数据roles = models.Role.objects.all()#创建分页对象pg = MyPagenumber2Pagination()#在数据库中获取分页数据pager_roles = pg.paginate_queryset(queryset=roles, request=request,view=self)print(pager_roles)#对分页数据进行序列化ser = PagerSerialiser(instance=pager_roles, many=True)# return pg.get_paginated_response(ser.data)  #返回上一页或者下一页return Response(ser.data)分页第三种：cursionfrom rest_framework.response import Response
from api.utils.serializers.pager import PagerSerialiser
from rest_framework.pagination import PageNumberPagination,LimitOffsetPagination,CursorPaginationclass MyPageNumberPagination(PageNumberPagination):page_size=2  #默认两个page_size_query_param = 'size'  #传一个size参数 一页显示多少  http://127.0.0.1:8000/pager1/?page=1&size=3max_page_size = 5  #一页显示最大5个page_query_param = 'page'  #页码class MyPagenumber2Pagination(LimitOffsetPagination):default_limit = 3limit_query_param = 'limit'  #每页多少条数据offset_query_param = 'offset'  #第几个索引开始max_limit = 5class MyPagenumber3Pagination(CursorPagination):cursor_query_param = 'cursor'page_size = 2ordering = 'id'page_size_query_param = Nonemax_page_size = Noneclass Pager1View(APIView):def get(self,request, *args,**kwargs):#获取所有数据roles = models.Role.objects.all()#创建分页对象pg = MyPagenumber3Pagination()#在数据库中获取分页数据pager_roles = pg.paginate_queryset(queryset=roles, request=request,view=self)print(pager_roles)#对分页数据进行序列化ser = PagerSerialiser(instance=pager_roles, many=True)return pg.get_paginated_response(ser.data)  #返回上一页或者下一页