Django设置 DEBUG=False后静态文件无法加载解决

STATIC_URL = '/static/'
STATIC_ROOT = 'static' ## 新增行
STATICFILES_DIRS = [
  os.path.join(BASE_DIR, '/static/'), ##修改地方
]

from django.views import static ##新增
from django.conf import settings ##新增
from django.conf.urls import url ##新增

urlpatterns = [
  path('', include('user.urls')),  
　##　以下是新增
  url(r'^static/(?P<path>.*)$', static.serve,
      {'document_root': settings.STATIC_ROOT}, name='static'),
]

ERRORS: ?: 
(staticfiles.E002) The STATICFILES_DIRS setting 
should not contain the STATIC_ROOT setting.
System check identified 1 issue (0 silenced)

. 

os.path.join(BASE_DIR, '/static/'), #多加了/