Js得到两期相减结果代码

 <%--得到两期相减结果--%>
    <script type="text/javascript" language="javascript">
        function GetDateTime()
        {
           var vBeginDate=document.all["txbIntendBegin"].value;
           var vEndDate=document.all["txbIntendEnd"].value;
           if(vBeginDate!=null && vEndDate!=null)
           {
                var dBegin=vBeginDate.split(".");
                var dEnd=vEndDate.split(".");
                var dtBegin=new Date(dBegin[0],dBegin[1],dBegin[2]);
                var dtEnd=new Date(dEnd[0],dEnd[1],dEnd[2]);
                var TimeSpan=(dtEnd-dtBegin)/(60*60*1000)+24;
                if(TimeSpan<0)
                {  
                    //检查s
                    alert("截至日期必须大于起始日期!");
                    document.all["txbIntendEnd"].focus();
                    return false;
                }
                else
                {
                    var vWorkLoad= document.getElementById("txbIntendWorkload");
                    if(vWorkLoad!=null)
                    {
                        //界面中显示间隔(天)
                        vWorkLoad.value=TimeSpan.toString();
                    }
                }
           } 
           else
           {
             window.alert("没有资料");
               return false;
           }
           return true;
          
        }
    </script>