页面下有 camera，webgl canvas 下包装 cover-view，cover-view 下再包装 cover-image加载在线图片，为什么偶现加载失败不出来图片？如果加载失败调用了 binderror函数，如何进行处理使其加载成功？伪代码如下：

<view class="doll-game">
  <camera class="doll-game-camera"></camera>
  <canvas class="doll-3d-canvas" type="webgl" id="doll-3d-canvas" disable-scroll="true">
      <cover-view class="doll-sence">
        <!--方位键-->
        <cover-image binderror="imgE" src="https://ar-scene-source.nosdn.127.net/e97f856a5829bafd5970fb61d899881a/left.png" wx:if="{{ButtonUpVisible === 1}}" class="doll-btn doll-btn-up" id="ButtonUp" bindtouchstart="onPointDown" bindtouchend="onPointUp"></cover-image>

      </cover-view>
  </canvas>



</view>