我要评论要求：原先host里面已增加以下3行
202.102.101.105 intranet.corp
202.102.101.107 mail.intranet.corp
202.102.101.108 sip.intranet.corp
之后不需要此3行内容,所以运行以上vbs代码,来删除host文件此3行
'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
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