ajax编码有关问题，大侠帮忙！

ajax编码问题，在线等大侠帮忙！！！

public function ajax_page(){
 //header('Content-Type:text/html;charset=gbk');
 error_reporting(E_ALL);
 $page = $this->input->post('pg');
 $where = $this->input->post('action');
 $array = explode('_',$where);
 $condition['group_id'] = $array[0];
 $condition['status'] = $array[1];
 $condition['username'] = @iconv( "UTF-8","GBK", $array[2]);
 echo $condition['username'];
 $condition['display'] = 15;
 $condition['page'] = ($page-1) * 15;
 $num = $this->member_model->Selcount($condition);
 $url = base_url()."/index.php/admin/member_list/";
 $this->page->select = $where;
 $this->page_model->page($num,"15",$page,$url);
 $data['page'] = $this->page->pagenav;
 $data['user'] = $this->member_model->Selmember($condition);
 $this->load->language('admin/member');
 $data['lang'] = $this->lang->line('HtmlLanguages');
 //print_r($data['user']);//exit;
 
 $this->load->view('admin/member_list_ajax', $data);
 
 }