抖音小程序 boundingClientRect 获取不到dom宽高

抖音小程序 boundingClientRect 获取不到dom宽高 ，微信小程序、app、h5 是好的

<view  
    style="position: relative; width: 100%; height: 100%; overflow: visible"  
  >  
    <view  
      v-if="bg"  
      style="position: absolute"  
      :style="bgStyle"  
      draggable="false"  
    >  
      <axVUIRoot ref="vUIRootBg"> </axVUIRoot>  
    </view>  
    <AxMoveable  
      id="mapArea"  
      ref="mapArea"  
      style="width: 100%; height: 100%; display: block"  
      :x="mapX"  
      :y="mapY"  
      :scale="true"  
      :scale-value="mapScale"  
      :scale-min="mapScaleMin"  
      :scale-max="mapScaleMax"  
      :style-value="mapStyle"  
      @change="onchange"  
      @scale="onscale"  
    >  
这里是子组件  
 </view>  
    </AxMoveable>  
  </view>

let mapData = this.mapData;  
      let query = uni.createSelectorQuery().in(this);  
      query  
        .select("#mapArea")  
        .boundingClientRect((result) => {  
     console.log(result)  
  })  
        .exec();