js调用后台方法

 <asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true" />

 PageMethods.fsyzm($("#shouji").val(), funReady, funError);
 function funReady(result) {
            if (result != null) {
               
            }
            else {
              
            }

        }
        // err 就是后台方法返回的错误信息
        function funError(err) {
           
            alert("Error:" + err._message);
        }

 [System.Web.Services.WebMethod]
        public static string fsyzm(string sj)
        {

          
        //cl
        
        
        }