这是注册程序是一款当用户输入完用户名是，就会自动去数据库中查询用户要注册的用户名是否己经被注册了，如果是返回提示否则提示可以注册。
conn.php文件
| 代码如下 |
复制代码 |
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<script >
var xmlhttp
function showhint(str)
{
if (str.length==0)
{
document.getelementbyid("txthint").innerhtml=""
return
}
xmlhttp=getxmlhttpobject()
if (xmlhttp==null)
{
alert ("browser does not support http request")
return
}
xmlhttp.onreadystatechange=statechanged var geturl="conn.php?q="+str
//sid是增加一个随机数 防止页面启用缓存技术·
geturl=geturl+"&sid="+math.random()
geturl=encodeuri(geturl);
geturl=encodeuri(geturl);
xmlhttp.open("get",geturl,true)
xmlhttp.send(null)
}
function statechanged()
{
if (xmlhttp.readystate==4 || xmlhttp.readystate=="complete")
{
document.getelementbyid("txthint").innerhtml=xmlhttp.responsetext
}
}
function getxmlhttpobject()
{
var xmlhttp=null;
try
{
// firefox, opera 8.0+, safari
xmlhttp=new xmlhttprequest();
}
catch (e)
{
// internet explorer
try
{
xmlhttp=new activexobject("msxml2.xmlhttp");
}
catch (e)
{
xmlhttp=new activexobject("microsoft.xmlhttp");
}
}
return xmlhttp;
} </script>
</head>
<body bgcolor="#999999">
<center>
<form>
<table>
<tr>
<td>用户名：</td>
<td><input type="text" id="txt1" onkeyup="showhint(this.value)"></td>
</tr>
<tr align="center">
<td colspan="2"><span id="txthint"></span></td>
</tr>
</table>
</form>
</center>
</body>
</html> |
| 代码如下 |
复制代码 |
<?php
$q=$_get["q"];
$q = urldecode($q); if (strlen($q) > 0)
{
$conn = @mysql教程_connect("localhost","root","1010") or die ("mysql连接错误");
mysql_select_db("xin",$conn);
mysql_query("set names 'utf8'");
$sql = "select username from message where username = '$q'";
$query = mysql_query($sql);
@$row = mysql_fetch_array($query);
if(!empty($row['username']))
{
$response = "<font color=red>已经被注册！</font>";
}else
{
$response = "<font color=blue>恭喜！可以注册！</font>";
}
echo $response;
} ?> |
数据库
drop database if exists `xin`;
create database `xin` /*!40100 default character set utf8 */;
use `xin`;
create table `message` (
`id` int(11) not null auto_increment,
`username` varchar(20) default null,
primary key (`id`)
) engine=innodb auto_increment=2 default charset=utf8
永久地址：http://www.phprm.com/develop/34171.html
转载随意~请带上教程地址吧^^