CI框架，表述提交没有反应，这是为什么呢

class Login extends CI_Controller{

	function index(){

		$this->load->view('index');

	}

	function checklogin(){

		$this->load->model('test_m');

		$user=$this->test_m->user_select($_POST['name']);

		

		if($user){

			if($user[0]->upass==$_POST['pword']){

				echo "password right";

				$this->load->library('session');

				$arr=array('uid'=>$user[0]->uid);

				$this->session->set_userdata($arr);

				echo "
";

				echo $this->session->userdata('uid');

			}else{

					echo "password wrong";

			}

		}else{

			echo "user not exist";

		}

	}

}

	

?>