怎么用asp统计一个文件夹 所有文件大小

Function totalsize(size)
    If size<1024 Then
        totalsize=size&" Bytes"
    Elseif size<1048576 Then
        totalsize=Round((size/1024),2)&" KB"
    Else
        totalsize=Round((size/1024/1024),2)&" MB"
    End If
End Function
    set fs = CreateObject("Scripting.FileSystemObject")
    Set folder = fs.GetFolder(path)
    Response.Write(totalsize(folder.Size) & " "& vbCrLf)