php jquery check username ajax检查帐号唯一性
检查email唯一性，当然也方便改为这样注册帐号演示
html文件
XML/HTML Code
[*]<input name="username" id="username" type="text" />
js文件
JavaScript Code
[*]<script>
[*]$(document).ready(function(){
[*]$('#username').keyup(username_check);
[*]});
[*]
[*]function username_check(){
[*]var username = $('#username').val();
[*]if(username == "" || username.length < 4){
[*]$('#username').css('border', '3px #CCC solid');
[*]$('#tick').hide();
[*]}else{
[*]
[*]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();
[*] $('#tick').fadeIn();
[*] }
[*]
[*]}
[*]});
[*]}
[*]
[*]
[*]
[*]}
[*]
[*]</script>
check.php
PHP Code
[*]<?php
[*]include("conn.php");
[*]//
[*]$username = trim(strtolower($_POST['username']));
[*]$username = mysql_escape_string($username);
[*]
[*]if (eregi("^+@(+.)+{2,3}$",$username)) {
[*] //email通过检查
[*] $query = "SELECT email FROM username_list WHERE email = '$username' LIMIT 1";
[*] $result = mysql_query( $query );
[*] $num = mysql_num_rows($result);
[*]
[*] echo $num;
[*]}
[*]else
[*]
[*]{
[*]echo "1";//不能注册
[*]
[*]}
[*]?>
原文地址:http://www.freejs.net/article_biaodan_35.html
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