public function update(){
$id=$_GET['id'];
var_dump($id);
$aa = M("User"); // 实例化User对象
$list=$aa->where("id=$id")->select();
$data=array();
$data['name']=$_GET['name'];
$data['email']=$_GET['email'];
$data['content']=$_GET['content'];
dump($data);

$this->assign('list',$list);
$this->display('update');
$result = $aa->where("id=$id")->save($data);
if($result){
$this->redirect(“Index/vim”); //直接跳转，不带计时后跳转
}
更新不了数据啊 下面是html代码

<FORM method="post" action="__URL__/update">
<volist name='list' id='list'>
<input type="hidden" name="{$list.id}" />

<table width="562" height="118" border="1" align="center">
<tr>
<td height="74"><p>主题：
<input name="name" type="text" id="name" size="30" value="{$list.name}"/>
</p>
<p>邮箱:
<input name="email" type="text" id="email" size="30" value="{$list.email}"/>
</p>
<p>留言内容：
<textarea name="content" cols="50" rows="10" id="content" value="">{$list.content}</textarea>
</p>
<p> </p>
<input type="submit" value=" 更新 " />    <input type="reset" value=" 重 置 " />
</td>
</tr>
</table>
</volist>
</form>