1.在.WebApi项目中使用  NuGet Install-Package Microsoft.AspNet.WebApi.Cors

2.在xxxWebApiModule类中添加如下代码

public override void Initialize()        {            IocManager.RegisterAssemblyByConvention(Assembly.GetExecutingAssembly());            DynamicApiControllerBuilder                .ForAll
     
      (typeof(demoApplicationModule).Assembly, "app")                .Build();            Configuration.Modules.AbpWebApi().HttpConfiguration.Filters.Add(new HostAuthenticationFilter("Bearer"));            var cors = new EnableCorsAttribute("*", "*", "*");            GlobalConfiguration.Configuration.EnableCors(cors);        }