Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:9001/api/size/get. (Reason: CORS header 'Access-Control-Allow-Origin' missing).

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:9001/api/size/get. (Reason: CORS header 'Access-Control-Allow-Origin' missing).

打開API項目錄，命名用NuGet安裝Microsoft.AspNet.WebApi.Cors:

 在WebApiConfig.cs中，添加下麵代碼：

 private static void EnableCrossSiteRequests(HttpConfiguration config)
        {
            var cors = new EnableCorsAttribute(
              origins: "*",
              headers: "*",
              methods: "*"
              );
            config.EnableCors(cors);
        }

在路由中啟用CROSS，說對整個API項目有效...