为什么我的广告位不显示图片呢？

index.php

<?php

namespace app\index\controller;

class Index extends Base
{
    // 首页
    public function index()
    {
        // 获取首页大图相关数据
        $recommend = model('Featured')->getFeaturedsByType(0);
        // 获取广告位相关数据
        $ad = model('Featured')->getFeaturedsByType(1);

        return $this->fetch('', [
            'recommend' => $recommend,
            'ad' => $ad,
        ]);
    }
}

index.html

{include file="public/head,public/nav"}

    <div class="container">
        <div class="top-container">
            <div class="mid-area">
                <div class="slide-holder" id="slide-holder">
                    <a href="#" class="slide-prev"><i class="slide-arrow-left">111</i></a>
                    <a href="#" class="slide-next"><i class="slide-arrow-right">222</i></a>
                    <!-- 推荐位 -->
                    <ul class="slideshow" style="width: 500px">
                        {volist name="recommend" id="vo"}
                        <li><a href="" class="item-large"><img class="ad-pic" src="{$vo.image}" /></a></li>
                        {/volist}
                    </ul>
                </div>
                <div class="list-container">

                </div>
            </div>
        </div>
        <div class="right-sidebar">
            <div class="right-ad">
                <!-- 广告位 -->
                <ul class="slidepic">
                    {volist name="ad" id="vo"}
                    <li><a href=""><img src="{$vo.image}" /></a></li>
                    {/volist}
                </ul>

            </div>

        </div>

有的 ，只有刷新的时候一闪而过

同学你好，请检查是否存在首页右侧广告位的数据，可以在后台进行查询。如图所示：

注：如果没有首页右侧广告位数据或是审核状态的广告位是无法在前台正常展示的哦！祝学习愉快！