from django.shortcuts import render,redirect

def login(request):

    if request.method=='GET':

        return render(request,'login.html')

    elif request.method=="POST":

        user=request.POST.get('username')

        pwd=request.POST.get('password')

        if user=="root" and pwd=="":

            if request.POST.get('box')=="":   #checkbox被按下

                request.session.set_expiry(3600)  #session认证时间为3600s，3600s之后session认证失效

            request.session['username']=user   #user的值发送给session里的username

            request.session['is_userlogin']=True   #认证为真

            return redirect('/index')

        else:

            return redirect('/login')

    return render(request,'login.html')

def index(request):

    if request.session.get('is_userlogin',False):  #若session认证为真

        return render(request,'index.html',{'username':request.session['username']})

    else:

        return redirect('/login')

def logout(request): #撤销 request.session.clear() #删除session里的全部内容 return redirect('/login')