usky-website/web/application/controllers/admin/about.php

<?php
!defined('BASEPATH') && exit('No direct script access allowed');

class About extends MY_Admin_Controller
{
    protected $check_access = false;

    public function __construct()
    {
        parent::__construct();
        $this->load->model('admin_model','admin');
        $this->load->model('web_setting_model','web_setting');
    }

    public function edit()
    {
        $action = $this->input->get('action');
        $name = 'about';

        if($action == 'update'){
            $_POST[] =   $this->security->xss_clean($_POST);
            $content = trim($_POST['content']);
            
            if($this->web_setting->update($name , array("name"=>$name, "value"=>$content))){
                exit('<script language="javascript">alert("更新成功"); document.location.href="'.ADMIN_PATH.'/about/edit";</script>');
                }
            else
                exit('<script language="javascript">alert("更新失败"); document.location.href="'.ADMIN_PATH.'/about/edit";</script>');
        }
        $item =  $this->web_setting->getValueByName($name);

        $data['item'] = $item[0]['value'];
        $this->load->view('aboutEditView' , $data); 
    }


    public function pdf()
    {
        $action = $this->input->get('action');
        $name = 'pdf';

        if($action == 'update'){
            $_POST[] =   $this->security->xss_clean($_POST);
            $content = trim($_POST['content']);
            
            if($this->web_setting->update($name , array("name"=>$name, "value"=>$content))){
                exit('<script language="javascript">alert("更新成功"); document.location.href="'.ADMIN_PATH.'/about/pdf";</script>');
                }
            else
                exit('<script language="javascript">alert("更新失败"); document.location.href="'.ADMIN_PATH.'/about/pdf";</script>');
        }
        $item =  $this->web_setting->getValueByName($name);

        $data['item'] = $item[0]['value'];
        $this->load->view('aboutPdfView' , $data); 
    }


}