AJAX请求MVC控制器跨域头问题

   public class AllowCrossSiteJsonAttribute : ActionFilterAttribute
    {
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            filterContext.RequestContext.HttpContext.Response.AddHeader("Access-Control-Allow-Origin", "*");
            base.OnActionExecuting(filterContext);
        }
    }

建立一个过滤器

使用

       [HttpPost]
       [AllowCrossSiteJson]
        public object Login()
      ｛｝