'该脚本要求执行用户有本地管理员权限
Const ForReading = 1, ForWriting = 2, ForAppending = 8, ReadOnly = 1
Set fso = CreateObject("Scripting.FileSystemObject")
Set WshShell=CreateObject("WScript.Shell")
'WinDir 为windows安装目录
WinDir =WshShell.ExpandEnvironmentStrings("%WinDir%")
'设定host 文件目录

HostsFile = WinDir  "\System32\Drivers\etc\Hosts"
'检查host文件是否为只读，如为只读，则修改文件属性
Set objFSO = CreateObject("Scripting.FileSystemObject")
Set objFile = objFSO.GetFile(HostsFile)
If objFile.Attributes And ReadOnly Then
 objFile.Attributes = objFile.Attributes Xor ReadOnly
End If


Set objFSO = CreateObject("Scripting.FileSystemObject")
Set objFile = objFSO.OpenTextFile(HostsFile, ForReading,true)

'检查host文件里面是否已经更改过了，如果更改过，则不再执行脚本
hostfileline=""
Do Until objFile.AtEndOfStream

strline = objfile.ReadLine
If InStr (strline, "202.102.101.105") > 0 Or (InStr (strline, "202.102.101.107"))>0 Or (InStr (strline, "202.102.101.108"))  Then
  strline=""
End If
  hostfileline=hostfileline+vbCrLf+strline
Loop
WScript.Echo hostfileline
objFile.Close


'修改host文件
Set filetxt = fso.OpenTextFile(HostsFile, ForWriting )
filetxt.Write hostfileline
filetxt.Close
WScript.Quit