1 class Application extends \yii\base\Application
2 {
3     /**
4      * @var string the default route of this application. Defaults to ‘site‘.
5      */
6     public $defaultRoute = ‘site‘;

1 return [
2     ‘id‘ => ‘app-backend‘,
3     ‘defaultRoute‘=>‘user‘,//设置项要默认的控制器就OK
4     // ‘defaultRoute‘=>‘控制器名‘, //默认访问的控制器  

class UserController extends Controller
{
    public $defaultAction = ‘admin‘;//加上这一行就OK啦！admin是默认的方法名