服务端安装跨域组件

pip install django-cors-headers

添加子应用，settings/dev.py，代码：

INSTALLED_APPS = ['django.contrib.admin','django.contrib.auth','django.contrib.contenttypes','django.contrib.sessions','django.contrib.messages','django.contrib.staticfiles','rest_framework','corsheaders', # cors跨域子应用'home',  # apps已经在上面加入到python的系统导包路径列表了，这里还是出现背景颜色，原因是python虽然找到home，pycharm不知道。所以可以鼠标右键，设置apps为mark as source root
]

注册CorsMiddleware中间件【必须写在第一个位置】，settings/dev.py，代码：

MIDDLEWARE = ['corsheaders.middleware.CorsMiddleware',  # cors跨域的中间件'django.middleware.security.SecurityMiddleware','django.contrib.sessions.middleware.SessionMiddleware','django.middleware.common.CommonMiddleware','django.middleware.csrf.CsrfViewMiddleware','django.contrib.auth.middleware.AuthenticationMiddleware','django.contrib.messages.middleware.MessageMiddleware','django.middleware.clickjacking.XFrameOptionsMiddleware',
]

添加客户端访问服务端的白名单，设置允许哪些客户端客户端跨域访问服务端，settings/dev.py，代码：

# CORS的配置信息: 
# 方案1：
# CORS_ORIGIN_WHITELIST = (
#     'http://www.leshen.cn:3000',
# )
# CORS_ALLOW_CREDENTIALS = False  # 不允许ajax跨域请求时携带cookie# 方案2：
CORS_ALLOW_ALL_ORIGINS = True