python manage.py startapp demo

from django.http import HttpResponse

#訪問接口的時候，直接"hello Django API"。實際應用中，可以添加復雜的邏輯，最后給出返回值即可
def demo_res(request):
    return HttpResponse("hello Django API")

from django.urls import path

#導入views視圖
from demo import views

urlpatterns = [
    path("routerDemo/", views.demo_res),#routerDemo為訪問路徑，views.demo_res為當前路徑想要映射到的函數(shù)
]

from django.contrib import admin
from django.urls import path,include

urlpatterns = [
    path("admin/", admin.site.urls),
    path("st/",include("demo.urls")) #這里加了一個st，意思是在訪問   st/routerDemo/ 的時候才能訪問到寫好的API
]

python manage.py migrate

python manage.py runserver