CI框架，表达提交没有反应，这是为什么呢,该怎么解决

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";
		}
	}
}
	
?>