public function index()
  {
    $list = Db::table('user')->select();
    return view('login',['list'=>$list]);
  }
  //增加页面
  public function xian(){
    return view('Xian');
  }
  //增加至数据库
  public function insert(){
    $data = [
      'id'=>null,
      'name'=>$_POST['name'],
      'age'=>$_POST['age'],
    ];
    $list = Db::name('user')->insert($data);
    if($list){
      echo "添加成功";
    }
  }
  //删除数据库内容
  public function del(){
    $list = Db::table('user')->delete($_GET['id']);
    if($list){
      echo "删除成功";
    }
  }
  //显示修改页面
  public function gai(){
   /*  $list = $_GET;*/
    return view('Gai');
  }
  //修改数据库内容
  public function upda(){
    $list = Db::name('user')->where('id',$_POST['id'])->update(['name'=>$_POST['name'],'age'=>$_POST['age']]);
    if($list){
      echo '修改成功';
    }
  }

<form action="{:url('Login/upda')}" method="post">
  name<input type="text" name="id" value="{$_GET['id']}">
  name<input type="text" name="name" value="{$_GET['name']}"><br>
  age<input type="text" name="age" value="{$_GET['age']}"><br>
  <input type="submit">
</form>
{$_GET['id']} {$_GET['name']} {$_GET['age']}

{foreach $list as $v}
{$v.name}--{$v.age}&nbsp;&nbsp;&nbsp;<a href="{:url('Login/del')}" rel="external nofollow" rel="external nofollow" >删除</a><a href="{:url('Login/Gai')}" rel="external nofollow" rel="external nofollow" >修改</a><br>
{/foreach}
<a href="{:url('Login/xian')}" rel="external nofollow" rel="external nofollow" >添加</a>

{foreach $list as $v}
{$v.name}--{$v.age}&nbsp;&nbsp;&nbsp;<a href="{:url('Login/del')}" rel="external nofollow" rel="external nofollow" >删除</a><a href="{:url('Login/Gai')}" rel="external nofollow" rel="external nofollow" >修改</a><br>
{/foreach}
<a href="{:url('Login/xian')}" rel="external nofollow" rel="external nofollow" >添加</a>