check_user.php
<?php $link=mysqli_connect(‘localhost‘,‘root‘,‘root‘,‘test‘);//连接数据库 if(mysqli_connect_errno()){ echo mysqli_connect_error(); } $query="select * from username where username=‘{$_GET[‘username‘]}‘"; $result=mysqli_query($link,$query); $data=mysqli_fetch_assoc($result); echo $data=json_encode($data); ?>
index.php
<!DOCTYPE html> <html lang="zh-CN"> <head> <meta charset="UTF-8"> <title>Document</title> <script type="text/javascript" src="js/jquery.min.js"></script> <script type="text/javascript" src="js/index.js"></script> </head> <body> <input type="text" id="namevalue"><span class="error"></span> <br> <button id="btn">Send</button> 结果:<span id="result"></span> </body> </html>
index.js
$(function(){ $("#namevalue").blur(function(){ $.get("/jquery/check_user.php",{ username:$("#namevalue").val() },function(data,status){ if(data!=null){ $("#result").text(""); $(".error").text("用户名已注册"); }else{ $(".error").text(""); $("#result").text($("#namevalue").val()); } },"json"); }); });
时间: 2024-08-17 12:20:50