编写asp代码截取字符串

编写asp代码截取字符串：

'函数名：SubstZFC
'作 用：截字符串，汉字一个算两个字符，英文算一个字符
'参 数：str ----原字符串
' strlen ----截取长度
'返回值：截取后的字符串

'适用：标题截取指定字符，如果用LEFT截取，当有英文时就会出现取出来的标题明显太短。
'**************************************************
Public Function SubstZFC(ByVal str, ByVal strlen)
If str = "" Then
SubstZFC = ""
Exit Function
End If
Dim l, t, c, i, strTemp
str = Replace(Replace(Replace(Replace(str, " ", " "), """, Chr(34)), ">", ">"), "<", "<")
l = Len(str)
t = 0
strTemp = str
strlen = CLng(strlen)
For i = 1 To l
c = Abs(Asc(Mid(str, i, 1)))
If c > 255 Then
t = t + 2
Else
t = t + 1
End If
If t >= strlen Then
strTemp = Left(str, i)
Exit For
End If
Next
SubstZFC = Replace(Replace(Replace(Replace(strTemp, " ", " "), Chr(34), """), ">", ">"), "<", "<")
End Function