<?=Html::a('
            <img class="list-group-item-icon" src="/frontend/web/images/kplus/[email protected]">退出
            <img class="list-group-item-icon icon-right" src="/frontend/web/images/kplus/[email protected]">
            ', 
            Url::to(['/site/logout']), 
            [
                'class' => 'list-group-item',
                'data' => [
                    'method' => 'post',
                    'params' => [
                        '_csrf-frontend' => Yii::$app->request->csrfToken
                    ]
                ]
            ]
            )
 ?>