跨域问题

问题：
Access to XMLHttpRequest at ‘http://xxx.xxx.xxx.xxx/admin/feedback' from origin ‘http://localhost:63342' has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.

分析：

静态html页面与后端服务不在同一个域下面，后端flask服务此接口没有放开外部访问，如何放开接口外部访问呢？

解决：

1. 安装flask cors

   flask-cors==4.0.0

2. 接口添加cross_origin装饰器

   from flask_cors import cross_origin
   
   
   @app.route(f"{url_prefix}/feedback", methods=['POST'])
   @cross_origin()
   def feedback():
       pass

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好记性不如烂笔头，没事记一记。