简述什么是FBV和CBV？

FBV 函数视图
# FBV 写法
# urls.py
 url(r'^login/$',views.login, name="login"),

# views.py
def login(request):
    if request.method == "POST":
        print(request.POST)
    return render(request,"login.html")


CBV 类视图
# urls.py    
url(r'^login/$',views.Login.as_view(), name="login"), 

# views.py
from django.views import View
class Login(View):   # 类首字母大写
    def get(self,request):
        return render(request, "login.html")
    def post(self,request):
        print(request.POST)
        return HttpResponse("OK")