<cover-view slot='callout'>

      <cover-view wx:for="{{markers}}" wx:key="id" wx:for-index="idx" wx:for-item="marker">

        <cover-view marker-id="{{marker.id}}">

          <cover-view wx:if="{{curClusterItem.markerID == marker.id}}">

            <cover-view wx:if="{{curClusterItem.itemType == ClusterItemType.PHOTO}}">

              <cover-image class="callout-photo" mode="aspectFit" src="{{curClusterItem.detail.url}}" />

              <cover-view>'{{curClusterItem.detail.url}}'cover-view>

            cover-view>

          cover-view>

        cover-view>

      cover-view>

    cover-view>

cover-image不显示，但同级的cover-view显示正常