asp的escape和unescape，解密js的escape的url加密

asp的escape和unescape，解密js的escape的url加密
<%
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

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 
%>