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<meta charset="UTF-8">
<?php
//里程碑 拿到浏览器提交的数据,数据重现(现场恢复) 无状态协议模式 stateless
//实现单选,复选,下拉框的数据重现
if(isset($_POST['ok'])){
//单选按钮与复选框在用户没有操作的情况下不会提交默认值到服务器,因此需要单独做逻辑处理
//var_dump($_POST);
echo $_POST['name'];
echo $_POST['age'];
$name=$_POST['name'];
$age=$_POST['age'];
}else{
$name="姓名不能为空";
$age = "";
}
?>
<form action="" method="post">
姓名:<input type="text" id="name" name="name" value="<?php echo $name;?>"><br>
年龄:<input type="text" id="age" name="age" value="<?php echo $age;?>"><br></br>
<br>
<input type="submit" id="ok" name="ok" value="ok">
</form>
<script>
</script>