?php
$file = dirname(__FILE__).'/index.html';
$timex=time()-filemtime($file); //間隔時間，單位秒
if($timex>7200){ //間隔大于2小時，重新生成
echo "script language=javascript src='crhtml.php'>/script>";
}
?>

%
'不緩存
Response.Buffer = True 
Response.ExpiresAbsolute = Now() - 1 
Response.Expires = 0 
Response.cachecontrol = "no-cache"
'讀取最后修改時間
FPath=server.mappath("index.html") 
set fso=server.CreateObject("scripting.filesystemobject") 
If fso.fileExists(FPath) Then 
Set f = fso.GetFile(FPath) 
crdate=f.DateLastModified
end if
if DateDiff("h",crdate,now())>10 then '時間間隔大于一定值
response.write "iframe border=0 frameborder=0 scrolling=no width=0 height=0 src=""/crhtml.asp"">/iframe>"
end if
%>

Dim fso
Set fso = CreateObject("Scripting.FileSystemObject")
f1="F:\webroot\jb51net\index_def.htm"
f2="F:\webroot\jb51net\index.htm"
fsize=50000 '50k
set fn2=fso.GetFile(f1)
flsize2=fn2.size
fldate2=fn2.datelastmodified
set fn=fso.GetFile(f2)
flsize1=fn.size
fldate1=fn.datelastmodified
If fso.FileExists(f1) and flsize2>fsize and fldate2>fldate1 Then
fso.getfile(f1).copy(f2)
if err.number=0 then WriteHistory "成功"now()".........","log.txt"
end if

Sub WriteHistory(hisChars, path)
  Const ForReading = 1, ForAppending = 8
  Dim fso, f
  Set fso = CreateObject("Scripting.FileSystemObject")
  Set f = fso.OpenTextFile(path, ForAppending, True)
  f.WriteLine hisChars 
  f.Close
End Sub