一个汉字占2个字符.

<%

response.Write LenX("中国ren")   '7
response.Write LeftX("中国ren",4)  '中国
response.Write RightX("中国ren",5)   '国ren

Public Function LenX(ByVal sString)
Dim reslult, lngStringLen, strCharString, i
lngStringLen = Len(sString)
strCharString = ""
for i = 1 to lngStringLen
strCharString = Mid(sString, i, 1)
if Asc(strCharString) > 0 then reslult= reslult+ 1 else reslult= reslult+ 2
next
LenX= reslult
End Function 

Public Function LeftX(ByVal sString, ByVal lLength)
if isnull(sString) or lLength < 1 then Exit Function
Dim result, lngStringLength, strCharString, lngCounter ,i
lngStringLength = Len(sString)
result = ""
for i = 1 to lngStringLength
strCharString = Mid(sString, i, 1)
result = result & strCharString
if Asc(strCharString) > 0 then lngCounter = lngCounter + 1 else lngCounter = lngCounter + 2
if lngCounter >= lLength then Exit For
next
LeftX = result
End Function

Public Function RightX(ByVal sString, ByVal lLength)
if isnull(sString) or lLength < 1 then Exit Function
Dim result, lngStringLength, strCharString, lngCounter, i
lngStringLength = Len(sString)
result = ""
for i = lngStringLength to 1 step -1
strCharString = Mid(sString, i, 1)
result = strCharString & result
if Asc(strCharString) > 0 then lngCounter = lngCounter + 1 else lngCounter = lngCounter + 2 
if lngCounter >= lLength then Exit For
next
RightX = result
End Function

%>