ASP升级程序

<%
'文件名：updata.asp
'远程地址
const url="http://localhost/test/"
action=request("action")
if action="updata" then
download(url&"config.txt")
download(url&"pack.jpg")
response.Write("下载成功安装")
elseif action="install" then
str=openfile("config.txt")
if str="" then
response.write "缺少本地配置文件config.txt"
else
size=RegExpTest("size",str)
call install("pack.jpg",size)
end if
else
str=getpage(url&"config.txt")
if str="" then
response.write "不存在可用更新或者本地配置不正确"
response.end
end if
str1=openfile("config.txt")
if str1="" then
response.write "缺少本地配置文件config.txt无法获知本地程序的安装时间"
response.end
end if
updatatime=RegExpTest("time",str)
updatatime1=RegExpTest("time",str1)
if DateDiff("d",updatatime1,updatatime)>0 then
response.Write("存在可用更新，更新日期："&updatatime&"下载")
else
response.write "您的程序是最新的了"
end if
end if
function openfile(filename)
set fso=server.CreateObject("scripting.filesystemobject")
if fso.fileexists(server.MapPath(filename)) then
set f1=fso.opentextfile(server.mappath(filename),1,true)
openfile=f1.readall
f1.close
else
openfile=""
end if
set fso=nothing
end function
function getpage(url)
set xmlhttp=server.createobject("Microsoft.XMLHTTP")
xmlhttp.open "get",url,false
xmlhttp.send
if xmlhttp.status<>200 then