在页面上显示倒计时

    显示提示时间#region  显示提示时间
        /**//// <summary>
        /// 显示提示时间
        /// </summary>
        private    void    ShowTime()
        ...{

            int second    =    0;
            TimeSpan diff;
            string message    =    string.Empty;

            if (EnableWrite() )
            ...{
                 diff=ExamETime     .Subtract( System.DateTime.Now );
                    message=" 之后考试结束";
            }
            else
            ...{
                 diff=ExamBTime.Subtract(System.DateTime.Now);
                message=" 之后考试开始";

            }
            //ShowTime
               
                //=ExamETime.Subtract(ExamBTime);

            second    =    Convert.ToInt32(    diff.TotalSeconds    );

            string    scriptString    =    string.Empty;
                   
            scriptString    =    " <script   language='Javascript'>  "+
                            //"<!--  "+
                            "     var sum="+    second.ToString()    +";"+

                            "     function cDate(oSum)    "+
                            "     {     "+
                            "         var min=Math.floor(oSum/60);    "+
                            "         if(min<1)    "+
                            "         {    "+
                            "             min==0    "+
                            "         }    "+
                            "     var sec=oSum%60;    "+

                            "     str=min+':'+sec+'"+message+"';    "+
                            "     return str    "+
                            "     }"+

                            "     function submitForm()    "+
                            "     {    "+
                            "         sum=sum-1    "+

                            "     document.getElementById('Time').value= cDate(sum)    "+

                            "     if(sum==0)    "+
                            "         {    "+
                            "             clearInterval(newstimer);    "+
                            "             document.getElementById(    'But_HandOver'    ).click();"+
                            "             document.getElementById(    'But_HandOver'    ).disabled='disabled';"+
                            "         }    "+
                            "     }"+
                            " var newstimer=setInterval('submitForm()',1000);"+
                        //    "-->   "+
                            " </script>    ";


                         if (!IsStartupScriptRegistered("ShowTime"))
                         ...{
                             Page.RegisterStartupScript("ShowTime",scriptString);
                         }
        }

        #endregion