在线时间:8:00-16:00
迪恩网络APP
随时随地掌握行业动态
扫描二维码
关注迪恩网络微信公众号
从数据库my中的username用户表里验证: checkusername.html: 复制代码 代码如下: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>无标题文档</title> </head> <script language="javascript"> var xmlHttp; function createXMLHttpRequest(){ if(window.ActiveXObject){ xmlHttp = new ActiveXObject("microsoft.XMLHTTP"); } else if(window.XMLHttpRequest){ xmlHttp = new XMLHttpRequest(); } } function send_request(url,data){ createXMLHttpRequest(); xmlHttp.open("POST",url,true); xmlHttp.onreadystatechange = check_lll; xmlHttp.setRequestHeader("CONTENT-TYPE", "application/x-www-form-urlencoded"); xmlHttp.send("username=" + data); } function check_lll(){ if(xmlHttp.readyState == 4){ if(xmlHttp.status == 200){ alert(xmlHttp.responseText); } } } function check_username(){ var f = document.form1; var username = f.username.value; if(username == ""){ alert("NULL"); return false; } else{ send_request("check_it.php",username); } } </script> <body> <form id="form1" name="form1" method="post" action=""> <p> </p><p> 姓名: <input type="text" name="username" /> </p> <input type="button" value="check it" onclick="check_username()" /> <p> </p> <p> </p> </form> </body> </html> check_it.php: 复制代码 代码如下: <?php $username = $_POST["username"]; $conn = mysql_connect("localhost:3306","root","123"); mysql_select_db("my",$conn); $sql = "select * from username where username = '$username'"; $result = mysql_query($sql,$conn); $num = mysql_fetch_array($result); if($num > 0){ printf("can't use"); } else{ printf("It can use"); } ?> |
请发表评论