asp ajax注册验证之 防止用户名输入空格

<% 
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Function ReplaceText(fString,patrn,replStr) 
Set regEx = New RegExp ' 建立正则表达式。 
regEx.Pattern = patrn ' 设置模式。 
regEx.IgnoreCase = True ' 设置是否区分大小写。 
regEx.Global = True ' 设置全局可用性。 
ReplaceText = regEx.Replace(""&fString&"",""&replStr&"") ' 作替换。 
Set regEx=nothing 
End Function 
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Function HTMLEncode(fString) 
fString=Trim(fString) 
fString=Replace(fString,CHR(9),"") 
fString=Replace(fString,CHR(13),"") 
fString=Replace(fString,CHR(22),"") 
fString=Replace(fString,CHR(38),"&") '“&” 
fString=Replace(fString,CHR(32)," ") '“ ” 
fString=Replace(fString,CHR(34),""") '“"” 
fString=Replace(fString,CHR(37),"%") '“%” 
fString=Replace(fString,CHR(39),"'") '“'” 
fString=Replace(fString,CHR(42),"*") '“*” 
fString=Replace(fString,CHR(43),"+") '“+” 
fString=Replace(fString,CHR(44),",") '“,” 
fString=Replace(fString,CHR(45)&CHR(45),"--") '“--” 
fString=Replace(fString,CHR(92),"/") '“/” 
'fString=Replace(fString,CHR(95),"_") '“_” 
fString=Replace(fString,CHR(40),"(") '“(” 
fString=Replace(fString,CHR(41),")") '“)” 
fString=Replace(fString,CHR(60),"<") '“<” 
fString=Replace(fString,CHR(62),">") '“>” 
fString=Replace(fString,CHR(123),"{") '“{” 
fString=Replace(fString,CHR(125),"}") '“}” 
fString=Replace(fString,CHR(59),";") '“;” 
fString=Replace(fString,CHR(10),"<br>") 
fString=ReplaceText(fString,"([&#])([a-z0-9]*);","$1$2;") 
fString=ReplaceText(fString,"(fuck|shit)",string(len("&$1&"),"*")) 
if IsSqlDataBase=0 then '过滤片假名(日文字符)[/u30A0-/u30FF] by yuzi 
fString=escape(fString) 
fString=ReplaceText(fString,"%u30([A-F][0-F])","0$1;") 
fString=unescape(fString) 
end if 
HTMLEncode=fString 
End Function 
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Function RequestInt(fString) 
RequestInt=Request(fString) 
if IsNumeric(RequestInt) then 
RequestInt=int(RequestInt) 
else 
RequestInt=0 
end if 
End Function 
'''''''''''''''''''''''''''''''''''' 
UserName=HTMLEncode(unescape(Request.QueryString("UserName"))) 
UserNameLength=RequestInt("UserNameLength") 
If len(UserName)<>UserNameLength Then 
response.write "用户名非法！" 
Else 
response.write "用户名合法！" 
End If 
%>