has been blocked by CORS policy: No ‘Access-Control-Allow-Origin‘ header is present on the requested

问题如图：

安装django-cors-headers

# 添加注册应用corsheaders
INSTALLED_APPS = [
    ...
    'corsheaders',
    ...
]

  # 添加中间键
MIDDLEWARE = [
    'corsheaders.middleware.CorsMiddleware',  # 加在第一行
    ...
]

# 添加白名单
CORS_ORIGIN_WHITELIST = (
    'http://localhost:8081',
    'http://127.0.0.1:8081',
)
# 允许ajax跨域请求时携带cookie
CORS_ALLOW_CREDENTIALS = False

重启后端项目

访问http://localhost:8081/，如图数据已经展示