检查用户名是否存在

return false;
}
if(ername.value.length<5 || ername.value.length>20) {
alert("用户名填写不正确，请填写5到20个字符的用户名！");
ername.focus();
alert("密码填写不正确，请填写6到16个字符的用户名！");
document.form1.password.focus();
return false;
}
if(checkspace(document.form1.PwdConfirm.value)) {
alert("确认密码不能为空！");
</div></td>
</tr>
</table>
</form>
<%
if request("tt")="qq" then
dim username,password,PwdConfirm,email,addtime
if(temp.value!="")
{
if(!myreg.test(temp.value))
{
alert('提示\n\n请输入有效的E_mail！');
document.form1.email.focus();
return false;
}
}
if(checkspace(document.form1.email.value)) {
return false;
}
if(checkspace(document.form1.password.value)) {
alert("密码不能为空！");
document.form1.password.focus();
return false;
}
if(document.form1.password.value.length<6 || document.form1.password.value.length>16) {
<td bgcolor="#F7EED5"><input name="PwdConfirm" type="text" id="PwdConfirm" size="20" maxlength="20" /></td>
<td bgcolor="#F7EED5" class="t3"> </td>
document.form1.PwdConfirm.focus();
return false;
}
if(document.form1.password.value!=document.form1.PwdConfirm.value){
alert("输入的密码和确认密码不一致，请重新填写！");
</tr>
<tr>
<td bgcolor="#F7EED5" class="t3">密码：</td>
<td bgcolor="#F7EED5"><input name="password" type="text" id="password" size="20" maxlength="20" /></td>
<tr>
<td colspan="3" bgcolor="#F7EED5"> </td>
</tr>
<tr>
<td width="16%" bgcolor="#F7EED5" class="t3">用户名：</td>
}
function chaa3(chak1){
var str='0';
return(str== chak1);
}
function checkclick(msg){
if(confirm(msg)){
event.returnValue=true;
}else{
event.returnValue=false;
<input type="submit" name="button" id="button" value="提交" onClick="return addcheck();" />
<input type="reset" name="button2" id="button2" value="重置" />
</tr>
<tr>
<td bgcolor="#F7EED5" class="t3">邮箱：</td>
<td bgcolor="#F7EED5"><input name="email" type="text" id="email" size="20" maxlength="40" /></td>
<td bgcolor="> </td>
</tr>
<tr>
<td bgcolor="#F7EED5" class="t3">确认密码：</td>
}
}
//-->
</script>
<form id="form1" name="form1" method="post" action="本页?tt=qq">
<table width="90%" border="0" align="center" cellpadding="3" cellspacing="1" bgcolor="#999933">
response.write "alert('注册成功!');"
response.write "this.location.href='denglu.asp';</SCRIPT>"
rs.close
set rs=nothing
end if
end if
%>
set rs=server.createobject("adodb.recordset")
rs.open sql,conn,1,3
if not(rs.eof and rs.bof) then
Response.write("<script language='javascript'>alert('这个用户名已存在，请重新输入!');history.back();</script>")
<script type="text/javascript">
<!--
function addcheck()
{
if(checkspace(ername.value)) {
alert("用户名不能为空！");
ername.focus();
alert("邮箱不能为空！");
document.form1.email.focus();
return false;
}
////////////////////////
}
function checkspace(checkstr) {
var str = '';
for(i = 0; i < checkstr.length; i++) {
Response.end()
else
rs.addnew
rs("username")=username
rs("email")=email
rs("addtime")=date()
rs.update
rs.close
response.write "<script language='javascript'>"
username=trim(request("username"))
password=trim(request("password"))
PwdConfirm=trim(request("PwdConfirm"))