springboot 页面：been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the

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

数据源和访问源是否同源的检验。如果static下的页面在文件资源管理器或IDE中启动就会产生，启动springboot Application后应用网址（本地网址、局域网网址、广域网网址均可）访问就不会产生。