1. 开发模式
        - 普通开发方式（前后端放在一起写）
        - 前后端分离
    
    2. 后端开发
        为前端提供URL（API/接口的开发）
        注：永远返回HttpResponse

    3. Django FBV、CBV
        FBV,function base view
            def users(request):
                user_list = [‘alex‘,‘oldboy‘]
                return HttpResponse(json.dumps((user_list)))
                
        CBV,class base view 
            路由：
                url(r‘^students/‘, views.StudentsView.as_view()),
            
            视图：
                from django.views import View

                class StudentsView(View):

                    def get(self,request,*args,**kwargs):
                        return HttpResponse(‘GET‘)

                    def post(self, request, *args, **kwargs):
                        return HttpResponse(‘POST‘)

                    def put(self, request, *args, **kwargs):
                        return HttpResponse(‘PUT‘)

                    def delete(self, request, *args, **kwargs):
                        return HttpResponse(‘DELETE‘)