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+心得：
+
+太难了，太难了还有很多不懂的地方！尽力了。课后需要多加学习！注意细节细节
+
+```php
+
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>学生登入界面</title>
+</head>
+<body>
+<form action="jie.php" method="post">
+    <h1>学生系统登入界面</h1>
+    <table>
+   <tr>
+ <td>请输入您的账号<input type="text" name="user"></td>
+ </tr>
+        <tr>
+<td>请输入您的密码 <input type="password"name="password"></td>
+ </tr>
+        <tr>
+ <td><input type="submit" value="提交" name="submit"></td>
+ </tr>
+    </table>
+</form>
+</body>
+</html>
+
+    
+<?php
+
+include_once ('conn.php');
+if (!isset($_POST['submit'])){
+    echo "非法访问";
+}
+$id=$_POST['id']; //学号
+$name=$_POST['name']; //姓名
+$score=$_POST['score']; //学生成绩
+
+//定义sql语句
+$a="insert into 'user' (id,name,score)values 
+('$id','$name','$score')";
+//echo $a;
+$ret = mysqli_query($conn,$a);
+if($ret){
+    echo "添加成功！<a href='./cc.php'>返回首页</a>";
+}else{
+    echo "添加失败！";
+}
+
+
+
+
+?>
+
+<html>
+<head>
+    <title>学生信息表</title>
+
+</head>
+<h1 align="center">学生信息表</h1>
+<form action="jie.php" method="post">
+    <table align="center" border="1" width="300">
+        <tr>
+            <th>学号</th><td><input type="text" name="id"></td>
+            </tr>
+        <tr>
+            <th>姓名</th><td><input type="text" name="name"></td>
+        </tr>
+        <tr>
+            <th>成绩</th><td><input type="text" name="score"></td>
+
+        </tr>
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="取消"></td>
+        </tr>
+    </table>
+
+    <a href="cc.php">返回</a>
+</form>
+
+
+
+
+</html>
+
+
+<?php
+include_once('conn.php');
+$sql = "select * from `user` order by id";
+$result = mysqli_query($conn,$sql);
+?>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>学生信息管理系统</title>
+    <script>
+        function del(){
+            if(!window.confirm("确定要删除吗？")){
+                return false;
+            }
+        }
+    </script>
+</head>
+<body>
+<h1>学生信息管理系统-首页</h1>
+<table border="1" width="500">
+    <tr>
+        <th>学号</th>
+        <th>姓名</th>
+        <th>成绩</th>
+        <th>操作</th>
+    </tr>
+    <?php
+    // 循环之前可以做个判断，结果集是否为空。
+    if(!mysqli_num_rows($result)) {//
+        echo "<tr align='center'><td colspan='5'>暂无数据！</td></tr>";
+    }else {
+        while ($row = mysqli_fetch_assoc($result)) {
+            ?>
+            <tr align="center">
+                <td><?php echo $row['id'] ?></td>
+                <td><?php echo $row['name'] ?></td>
+                <td><?php echo $row['score'] ?></td>
+
+                <td><a href="edit.php?book_id=<?php echo $row['book_id'] ?>">修改</a>|
+                    <a href="delete.php?book_id=<?php echo $row['book_id'] ?>" onclick="return del();">删除</a></td>
+            </tr>
+            <?php
+        }
+    }
+    ?>
+</table>
+<a href="add.php">添加数据</a>
+</body>
+</html>
+
+
+        <?php
+//防止报错
+error_reporting(E_ALL ^ E_WARNING);
+// 连服务器
+$conn =mysqli_connect('localhost','root','123456','student') or die("服务器连接失败！");
+// 设置字符utf8
+mysqli_query($conn,'set names utf8');
+
+
+include_once('conn.php');
+$book_id=$_GET['id'];//  得到要删除的学生id
+
+
+// 执行sql语句。
+$sql = "delete from `user` where id=$id";
+
+$ret = mysqli_query($conn,$sql);
+if($ret){
+    echo "删除成功！<a href='./cc.php'>返回首页</a>";
+}else{
+    echo "修改失败！";
+}
+
+
+
+
+```
+
+
+
