还是关于cookies的
<%if request.cookies("play_time2")<="" then response.cookies("play_time2")=now()
v_time=DateDiff("s",cdate(request.cookies("play_time2")),now())
if v_time<>0 and v_time<=30 then
response.write "<script language=javascript>alert('30小时内无法重复！\n\n请在"&(31-v_time)&"小时后再提问！');history.back()</script>"
response.end
else
response.cookies("play_time2")=now()
end if
%>
如果我还是提交到此页面，那么上面的代码会重复几次，而我又必须把它放在此页面里，怎么才能让COOKIES防刷只读一次
