No ‘Access-Control-Allow-Origin‘ header is present on the requested resource.

 

解决方案  以C#为案例 : 

ctx.Response.Headers.Add("Access-Control-Allow-Origin", "*");//跨域

参考：

解决跨域No 'Access-Control-Allow-Origin' header is present on the requested resource. - 永远的幻想 - 博客园