1.pip install django-cors-headers
2.添加到INSTALLED_APPS，如下：
INSTALLED_APPS=[
...
'corsheaders',
...
]
3.添加到MIDDLEWARE列表
MIDDLEWARE=[# Or MIDDLEWARE_CLASSES on Django<1.10
...
'corsheaders.middleware.CorsMiddleware',
'django.middleware.common.CommonMiddleware',
...
]
settings.py 添加
CORS_ORIGIN_ALLOW_ALL=True
