一、
1.index介面的配置，
    在url檔案下面配置：from django.views.generic import TemplateView，url('^$', TemplateView.as_view(template_name='index.html'), name="index"),
在settings檔案下配置：STATICFILES_DIRS = [(os.path.join(BASE_DIR, 'statics'))]
2.html的替換路徑：href="/statics/css/reset.css"
3.登入介面的跳轉配置：url('^login/$', TemplateView.as_view(template_name='login.html'), name="login"),
 
二、使用者登陸實現
1.配置view
    def user_login(request):
        if request.method == "POST":
            user_name = request.POST.get("username", "")
            user_password = request.POST.get("password", "")
            user = authenticate(username=user_name, password=user_password)
            if user is not None:
 
                login(request, user)
                return render(request, "index.html")
            else:
                return render(request, "login.html", {})
        elif request.method == "GET":
            return render(request, "login.html", {})
2.配置index登陸
    {% if request.user.is_authenticated %}
 
    {% else %}
    {% endif %}
3.login介面配置：<form action="/login/" method="post" autocomplete="off">
4.url介面配置：url('^login/$', user_login, name="login")
5.自定義auth方法，進行邏輯判斷：
    1）AUTHENTICATION_BACKENDS = ['users.views.CustomBackend',]
    2）class CustomBackend(ModelBackend):
        def authenticate(self, username=None, password=None, **kwargs):
            try:
                user = UserProfile.objects.get(username = username)
                if user.check_password(password):
                    return user
            except Exception as e:
                return None
三、重寫使用者登陸方法（繼承類的方法來實現）
1.from django.views.generic.base import View
2.
    class LoginView(View):
        def get(self, request):
            return render(request, "login.html", {})
        def post(self, request):
            user_name = request.POST.get("username", "")
            user_password = request.POST.get("password", "")
            user = authenticate(username=user_name, password=user_password)
            if user is not None:
                login(request, user)
                return render(request, "index.html")
            else:
                return render(request, "login.html", {"msg": "使用者名稱或密碼錯誤"})
3.修改url檔案：url('^login/$', LoginView.as_view(), name="login")
四、form的用途
1.定義forms類：
    class LoginForm(forms.Form):
        username = forms.CharField(required=True)
        password = forms.CharField(required=True)
2.重寫方法
    def post(self, request):
        login_form = LoginForm(request.POST)
        if login_form.is_valid():
            user_name = request.POST.get("username", "")
            user_password = request.POST.get("password", "")
            user = authenticate(username=user_name, password=user_password)
            if user is not None:
                login(request, user)
                return render(request, "index.html")
            else:
                return render(request, "login.html", {"msg": "使用者名稱或密碼錯誤"})
        else:
            return render(request, "login.html", {"login_form": login_form})
3.前端處理
    （1）錯誤資訊返回：{% if login_form.errors.username %} errorput {% endif %}
（2）報錯列印：{% for key,error in login_form.errors.items %}{{ error }} {% endfor %}{{ msg }}