set open=createobject("scripting.filesystemobject")
str=inputbox("请输入文件(夹)名称或文件(夹)完整路径:",wscript.scriptname)
if open.fileexists(str) then
f1=open.getfile(str).size
if f1<=1024 then
sum=f1/1024
t=split(sum,".")(0)&"."&left(split(sum,".")(1),2)
else
if f1<=1024^2 then
sum=f1/1024^2
t=split(sum,".")(0)&"."&left(split(sum,".")(1),2)
else
sum=f1/1024^2
t=split(sum,".")(0)&"."&left(split(sum,".")(1),2)
end if
end if
else
f2=open.getfolder(str).size
if f2<=1024 then
sum=f2/1024
t=split(sum,".")(0)&"."&left(split(sum,".")(1),2)
else
if f2<=1024^2 then
sum=f2/1024^2
t=split(sum,".")(0)&"."&left(split(sum,".")(1),2)
else
sum=f2/1024^2
t=split(sum,".")(0)&"."&left(split(sum,".")(1),2)
end if
end if
end if
msgbox round(t,2)&" MB",64,wscript.scriptname
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function HumanSize(size)
    Dim Units, Gates, SizeStr
    Units = Array("Byte", "KB", "MB", "GB", "TB")
    Gates = Array(1, 1024, 1024^2, 1024^3, 1024^4)

    SizeStr = "0Byte"
    for i=UBound(Units) to 0 Step -1
        if size>=Gates(i) then
            SizeStr = FormatNumber(Size/Gates(i), 2) & Units(i)
            exit for
        end if
    next
HumanSize = SizeStr
end function

'example
set fso = CreateObject("Scripting.FileSystemObject")
Size = fso.GetFolder(".").Size
WScript.Echo Size & " = " & HumanSize(Size)
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Function format_size(size)
    On Error Resume Next 'For Log(0)
    sizes = array(" Bytes", " KB", " MB", " GB", " TB", " PB")
    i = Int(Log(size) / Log(1024))
    format_size = Round(size / 1024 ^ i, 2) & sizes(i)
End Function

'Example
Set fso = CreateObject("Scripting.FileSystemObject")
size = fso.GetFolder(".").Size
WScript.Echo format_size(size)
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