为什么加载不到模型的方法

此岸叶落

出现的问题：
A PHP Error was encounteredSeverity: Notice
Message:  Undefined property:  Note:Note_model
Filename: controllers/note.php
Line Number: 19

Fatal error:  Call to a member function index() on a non-object in D:\www\dilicms\application\controllers\note.php on line 19

1.我的控制器是note.php
代码如下：<?php
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
class Note extends CI_Controller{
function __construct()
{
  parent::__construct();
}
function index()
{
     $this->load->model('note_model');
     $data['item']=$this->Note_model->index();
     $this->load->view('noteview',$data);
}
function save(){
     
}
function xianshi(){
     
}

}
?>
2.模型note_model.php
代码如下：
<?php
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
class Note_model extends CI_Model {
    var $obj = '';
    var $zfcontent = '';
    var $author = '';
    function __construct(){
        parent::__construct();
    }
    function index(){   
        $query = $this->db->query('select * from dili_u_m_content');
        return $query->result();
    }
}
?>

花脸

$this->load->model('note_model'); => $this->load->model('Note_model');