Yii2:如何添加图像作为导航栏菜单项

use yii\bootstrap\Nav;
use yii\bootstrap\NavBar;

NavBar::begin([
    'brandLabel' => 'My Application',
    'brandUrl' => Yii::$app->homeUrl,
    'options' => [
        'class' => 'navbar-inverse navbar-fixed-top',
    ],
]);

$menuItems = [
    ['label' => 'Home', 'url' => ['/site/index']],
    ['label' => 'About', 'url' => ['/site/about']],
    ['label' => 'Contact', 'url' => ['/site/contact']],
    ['label' => 'Image', 'url' => ['/site/image'], 'linkOptions' => ['class' => 'image-link']],
];

echo Nav::widget([
    'options' => ['class' => 'navbar-nav navbar-right'],
    'items' => $menuItems,
]);

NavBar::end();