doAction.php页面，提交按钮，弹出添加成功之后
在跳转回userList.php页面前的一瞬间，闪过一个错误提示页面，只有一瞬间，但不知道为什么，我把代码贴出来，大家帮我看看= =
4 回答
//这是addUser.php页面代码
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<title>添加用户</title>
</head>
<body>
<h2>添加用户</h2>
<form action="doAction.php?act=addUser" method="post">
<table cellpadding="0" cellspacing="0" bgcolor="#ABCDEF" width="45%" border="1">
<tr>
<td>用户名</td>
<td><input type="text" name="username" placeholder="请输入用户名" required="required"></td>
</tr>
<tr>
<td>密码</td>
<td><input type="password" name="password" placeholder="请输入密码" required="required"></td>
</tr>
<tr>
<td>年龄</td>
<td><input type="text" name="age" min="1" max="125" placeholder="请输入年龄"></td>
</tr>
<tr>
<td colspan="2"><input type="submit" name="" value="提交"></td>
</tr>
</table>
</form>
</body>
</html>
//这是userList页面代码
<?php
$con=new mysqli('localhost','root','','test');
if($con->connect_errno){
die('ERROR: '.$con->connect_error);
}
$sql="SELECT id,username,age FROM user";
$res=$con->query($sql);
if($res&&$res->num_rows>0){
$row=$res->fetch_all(MYSQLI_ASSOC);
}
?>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<title>用户列表</title>
</head>
<body>
<h2>用户列表-<a href="addUser.php">添加用户</a></h2>
<table border='1' cellspacing="0" cellpadding="0" width="80%" bgcolor="#ABCDEF">
<tr>
<td>用户编号</td>
<td>用户名</td>
<td>年龄</td>
<td>操作</td>
</tr>
<?php foreach ($row as $value): ?>
<tr>
<td><?php echo $value['id'] ?></td>
<td><?php echo $value['username']?></td>
<td><?php echo $value['age']?></td>
<td><a href="doAction.php">更新</a>|<a href="delete.php">删除</a></td>
</tr>
<?php endforeach; ?>
</table>
</body>
</html>
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