JavaScript调用后台的三种方法实例_javascript技巧

 

public static string BehindMethod()
        {
            return "这是一个后台的方法";
        }

 

   

   

   
      
      

   

   

[System.Web.Services.WebMethod]
        public static string GetImg(string ext)
        {
            System.Threading.Thread.Sleep(5000);//为了有点等待的效果，延迟5秒
            StringComparer sc = StringComparer.OrdinalIgnoreCase;
            string[] extArr = new string[] { "php", "asp", "aspx", "txt", "bmp" };
            bool f = extArr.Any(s=>sc.Equals(s,ext));   //判断传入的后缀名是否存在

            if (f)
            {
                return "image/54222860.jpg";
            }
            return "image/star1.jpg";
        }

     
     
   
 

        protected void Page_Load(object sender, EventArgs e)
        {
            AjaxPro.Utility.RegisterTypeForAjax(typeof(AjaxDemo));  //注册
        }

        [AjaxPro.AjaxMethod]
        public string GetImgByAjaxPro()
        {
            return "image/54222860.jpg";
        }

 function GetMethodByAjaxPro() {
            var a = JustTest.AjaxDemo.GetImgByAjaxPro();//JustTest是当前的名字空间，AjaxDemo表示后台类
            document.getElementById("imgAjaxPro").src = a.value;
        }