<%
Dim SessUserID
if session("userid")="" then
SessUserID=-9999 '这里只能定义为数字类型
else
SessUserID=session("userid")
end if
%>
<script language="JavaScript">
var UserID=<%=SessUserID%>;
function datum(){
if(UserID==-9999){
alert("请先登录");}
else{
location.href="/member/userdatum.asp";}
}
</script>