.net core 跨域配置

//配置跨域

            services.AddCors(options =>
            {
                options.AddPolicy("AllowAnyOrigin",policy =>policy.SetIsOriginAllowed((host) => true)
                                                                  .AllowAnyHeader()
                                                                  .AllowAnyMethod()
                                                                  .AllowCredentials());
            });
            services.AddDbConte