vbscript实现escape和unescape功能

'实现escape功能
Function VBsEscape(str)
    dim i,s,c,a
    s=""
    For i=1 to Len(str)
        c=Mid(str,i,1)
        a=ASCW(c)
        If (a>=48 and a<=57) or (a>=65 and a<=90) or (a>=97 and a<=122) Then
            s = s & c
        ElseIf InStr("@*_+-./",c)>0 Then
            s = s & c
        ElseIf a>0 and a<16 Then
            s = s & "%0" & Hex(a)
        ElseIf a>=16 and a<256 Then
            s = s & "%" & Hex(a)
        Else
            s = s & "%u" & Hex(a)
        End If
    Next
    VBsEscape = s
End Function
'实现unescape功能
Function VBsUnEscape(str)
    dim i,s,c
    s=""
    For i=1 to Len(str)
        c=Mid(str,i,1)
        If Mid(str,i,2)="%u" and i<=Len(str)-5 Then
            If IsNumeric("&H" & Mid(str,i+2,4)) Then
                s = s & CHRW(CInt("&H" & Mid(str,i+2,4)))
                i = i+5
            Else
                s = s & c
            End If
        ElseIf c="%" and i<=Len(str)-2 Then
            If IsNumeric("&H" & Mid(str,i+1,2)) Then
                s = s & CHRW(CInt("&H" & Mid(str,i+1,2)))
                i = i+2
            Else
                s = s & c
            End If
        Else
            s = s & c
        End If
    Next
    VBsUnEscape = s
End Function