1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>登录，支持enter键</title> 6 </head> 7 <body> 8 <h2>登录</h2> 9 <form action="pdologincheck.php" method="post" name="addForm" onsubmit="return CheckPost();"> 10 <div>用户名:<input type="text" name="username" /></div> 11 <div>密码:<input type="password" name="password" /></div> 12 <div><input type="submit" name="submit" value="登录"/></div> 13 </form> 14 <script language="javascript"> 15 function CheckPost () { 16 if (addForm.username.value == "") { 17 alert('用户名不能为空') 18 addForm.username.focus(); 19 //表单提交false不能少 20 return false; 21 } 22 if (addForm.password.value=="") { 23 alert('密码不能为空') 24 addForm.password.focus(); 25 return false; 26 } 27 28 } 29 </script> 30 </body> 31 </html>
php
1 <?php 2 header("Content-Type: text/html; charset=UTF-8"); 3 $username = $_POST['username']; 4 $password = $_POST['password']; 5 //连接数据库,分别表示：数据库地址，库名，用户名，密码 6 try{ 7 $pdo=new PDO("mysql:host=localhost;dbname=test","root","root"); 8 }catch (PDOException $e){ 9 die("fail to connect mysql".$e->getMessage()); 10 } 11 //查询 12 $sql="SELECT * FROM usermessage"; 13 foreach($pdo->query($sql) as $val){ 14 if($username==$val['username']&&$password==$val['password']){ 15 echo "登录成功"; 16 echo "<div>用户名：{$val['username']}密码：{$val['password']}</div>"; 17 //立即跳转 18 //header('Location:index2.php'); 19 //2秒后跳转 20 header('Refresh:2,Url=index2.php'); 21 exit; 22 } 23 } 24 echo "登录失败"; 25 ?>
注册 增删改
1 <?php 2 header("Content-Type: text/html; charset=UTF-8"); 3 $username = $_POST['username']; 4 $password = $_POST['password']; 5 //连接数据库,分别表示：数据库地址，库名，用户名，密码 6 try{ 7 $pdo=new PDO("mysql:host=localhost;dbname=test","root","root"); 8 }catch (PDOException $e){ 9 die("fail to connect mysql".$e->getMessage()); 10 } 11 //增加数据 12 $sql="INSERT INTO usermessage VALUES('$username','$password')"; 13 14 //更新数据,修改username为$username的密码 15 //$sql="UPDATE usermessage set password='$password' WHERE username='$username'"; 16 17 //删除数据 18 //$sql="DELETE FROM usermessage WHERE username='$username'"; 19 20 if( $pdo->exec($sql) ){ 21 echo "成功"; 22 }else{ 23 echo "失败"; 24 } 25 ?>