django补充CBV和FBV模式

django补充CBV和FBV模式
FBV模式---函数:经常用的方式
CBV模式---类
CBV中url连接时函数名后面要接.as_view()
class index（views.View）：
    @...
    def dispath(self,request,*arg,**kwarg):
        super...
如果对某一种请求做处理：单一装饰器
如果对请求做处理：dispatch单一装饰器
注：CBV模式中的装饰器要调用method_decorator
from django.utils.decorators import method_decorator
在执行后台程序分辨get和post传值之前要先执行调用的view函数中的dispatch方法进行处理
例：
from django import views
from django.utils.decorators import method_decorator
def outer(func):
    def inner(request,*args,**kwargs):
        print(request.method)
        return func(request,*args,**kwargs)
    return inner #闭包
class Login(views.View):
    message = ''
    #分发器
    def dispatch(self, request, *args, **kwargs):
        print("eric")
        req = super(Login,self).dispatch(request,*args,**kwargs)
        print("ericc")
        return req
    @method_decorator(outer)
    def get(self,request,*args,**kwargs):
        return render(request,"login.html")

    @method_decorator(outer)
    def post(self,request,*args,**kwargs):
        user = request.POST.get("user")
        pwd = request.POST.get("pwd")
        c=1#数据库取值对照
        if c:
            request.session["is_login"] = True
            request.session["username"] = user
            req=redirect("/login/")
            return req
        else:
            message = "用户名或密码错误"
            return render(request,"login.html",{"msg":message})