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0513会话控制作业
千山暮雪
Original
449 people have browsed it

1.登陆页前端 login.html

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <title>Title</title>
  6.     <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.js"></script>
  7. </head>
  8. <body>
  9. <form  id="loginForm">
  10.     <table>
  11.         <tr>
  12.             <td><label for="username">用户名:</label></td>
  13.             <td><input type="text" required autofocus placeholder="请输入用户名" name="username" id="username"></td>
  14.         </tr>
  15.         <tr>
  16.             <td><label for="password">密码:</label></td>
  17.             <td><input type="password" required autofocus placeholder="请输入密码" name="password" id="password"></td>
  18.         </tr>
  19.         <tr>
  20.             <td><img src="gd_captcha.php" alt="验证码" onclick="reloadImg()" id="img"></td>
  21.             <td><input type="text" name="captcha" id="captcha" placeholder="请输入验证码"></td>
  22.         </tr>
  23.         <tr>
  24.             <td></td>
  25.             <td><input type="button" value="登陆" id="btn" onclick="dologin()"></td>
  26.         </tr>
  27.     </table>
  29. </form>
  30. <script>
  31.     // 重新生成验证码
  32.     function reloadImg() {
  33.         $('#img').attr('src', "gd_captcha.php?id="+Math.random());
  34.     }
  35.     // 回车登陆
  36.     $('#btn').keydown(function (e) {
  37.         if (e.keyCode == 13) {
  38.             dologin();
  39.         }
  40.     });
  41.     // 登陆
  42.     function dologin() {
  43.         let username = $.trim($('#username').val()),
  44.             password = $.trim($('#password').val()),
  45.             captcha = $.trim($('#captcha').val());
  46.         if (username == '') {
  47.             alert('请输入用户名');
  48.             return false;
  49.         }
  50.         if (password == '') {
  51.             alert('请输入密码');
  52.             return false;
  53.         }
  54.         if (captcha == '') {
  55.             alert('请输入验证码');
  56.             return false;
  57.         }
  59.         $.post('dologin.php', {'username': username, 'password': password, 'captcha': captcha}, function (res) {
  60.             if (res.code > 0) {
  61.                 alert(res.msg);
  62.                 reloadImg();
  63.             } else {
  64.                 alert(res.msg);
  65.                 setTimeout(() => {
  66.                     window.location.href = 'index.php'
  67.                 }, 1000);
  69.             }
  70.         }, 'json')
  71.     }
  72. </script>
  73. </body>
  74. </html>

2.处理登陆 dologin.php

  1. <?php
  2. require 'connect.php';
  3. session_start();
  5. $username = $_POST['username'];
  6. $password = $_POST['password'];
  7. $captcha = strtolower($_POST['captcha']);
  9. if ($username == '') {
  10.     exit(json_encode(array('code' => 1, 'msg' => '用户名不能为空')));
  11. }
  12. if ($password == '') {
  13.     exit(json_encode(array('code' => 1, 'msg' => '密码不能为空')));
  14. }
  15. if ($captcha == '') {
  16.     exit(json_encode(array('code' => 1, 'msg' => '验证码不能为空')));
  17. }
  18. // 验证验证码
  19. if ($captcha != strtolower($_SESSION['captcha'])) {
  20.     exit(json_encode(array('code' => 1, 'msg' => '验证码不正确')));
  21. }
  22. // 验证用户
  23. $sql = "SELECT `username`,`password` FROM `users` WHERE `username`= ?; ";
  25. $stmt = $pdo->prepare($sql);
  26. $stmt->execute([$username]);
  27. $user  = $stmt->fetch();
  29. if ($user == false) {
  30.     exit(json_encode(array('code' => 1, 'msg' => '用户名不存在')));
  31. }
  32. if (md5($user['username'].$password) != $user['password']) {
  33.     exit(json_encode(array('code' => 1, 'msg' => '密码错误')));
  34. }
  35. // 验证成功后设置session
  36. $_SESSION['username'] = $username;
  37. exit(json_encode(array('code' => 0, 'msg' => '登陆成功')));

connect.php

  1. $dsn = 'mysql:host=127.0.0.1;port=3306;dbname=user';
  2. $username = 'root';
  3. $password = 'root123';
  4. $pdo = new PDO($dsn, $username, $password);

3.登陆成功后到主页index.php

  1. <?php
  2. session_start();
  3. echo $_SESSION['username']. '登陆成功';
  4. ?>
  5. <button name="logout" id="logout">安全退出</button>
  6. <script>
  7.     const btn = document.querySelector('#logout');
  8.     btn.onclick = (() => location.href='dologout.php')
  9. </script>

4.安全退出dologout.php

  1. session_start();
  3. session_destroy();
  5. exit('退出成功');
Correcting teacher：灭绝师太灭绝师太

Correction status：qualified

Teacher's comments：
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