def do_login(request):
    try:
        if request.method == 'POST':
            backform = BackForm(request.POST)
            if backform.is_valid():
                username = backform.cleaned_data['email']
                password = backform.cleaned_data['password']
                user = authenticate(email=username,password=password)
                print user
                if user:
                    user.backend = 'users.auth.customBackend'# 指定自定义的登录验证方式
                    auth_login(request, user)
                    return render(request,'common/index.html',locals())
                else:
                    return render(request,'common/error.html',{'error':'user is None'})
            else:
                render(request,'common/error.html',{'error':'backform is not valid'})
        else:
            render(request,'common/error.html',{'error':'request.method is not POST'})
    except Exception as e:
        logger.error(e)
    return render(request,'common/error.html',{'error':'e'})

return render(request,'common/error.html',{'error':'e'})