php+jquery ajax邮箱地址无刷新验证实例

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.js"></script>
<script><br> $(document).ready(function(){<br> $('#username').keyup(username_check);<br> });<br>  <br> function username_check(){ <br> var username = $('#username').val();<br> if(username == "" || username.length < 4){<br> $('#username').css('border', '3px #CCC solid');<br> $('#tick').hide();<br> }else{</script>

jQuery.ajax({
   type: "POST",
   url: "check.php",
   data: 'username='+ username,
   cache: false,
   success: function(response){
if(response == 1){
 //不可以注册
 $('#username').css('border', '3px #C33 solid'); 
 $('#tick').hide();
 $('#cross').fadeIn();
 }else{
 $('#username').css('border', '3px #090 solid');
 $('#cross').hide();
 $('#tick').fadeIn();
      }

}
});
}

}

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#tick{display:none}
#cross{display:none}
 

Username:
@@##@@
@@##@@

# FileName="Connection_php_mysql.htm"
# Type="MYSQL"
# HTTP="true"
$hostname_lr = "localhost";
$database_lr = "ordersiliconebracelets";
$username_lr = "root";
$password_lr = "";
$lr = mysql_pconnect($hostname_lr, $username_lr, $password_lr) or trigger_error(mysql_error(),E_USER_ERROR);
mysql_query("set names utf8;");
//if ($lr) {
//echo "非常好,MYSQL连接成功了!";
//} else {
//echo "不好意思,失败了！";
//}
mysql_select_db($database_lr, $lr);

//
$username = trim(strtolower($_POST['username']));
$username = mysql_escape_string($username);

if (eregi("^[_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3}$",$username)) {
 //email通过检查
 $query = "SELECT email FROM user WHERE email = '$username' LIMIT 1";
 $result = mysql_query( $query );
 $num = mysql_num_rows($result);
 
 echo $num;
}
else

{
echo "1";//不能注册

}
?>