hebei-chengben-car/modules/car/views/default/index.php

<?php
use app\assets\CoreAsset;
use app\assets\PluginsAsset;
$asset = CoreAsset::register($this);
$assetsUrl = $asset->baseUrl;
$pluginsAsset = PluginsAsset::register($this);
$pluginsUrl = $pluginsAsset->baseUrl;
use yii\widgets\ActiveForm;
?>

<div class="row ">
    <div class="col-12">
        <img src="<?php echo $assetsUrl;?>/images/u2.png" >
    </div>
</div>