applte/components/Uploader/Uploader.wxml

<!--components/Uploader.wxml-->
  <van-uploader preview-image="{{ true }}" preview-full-image="{{true}}"  max-count="1" capture file-list="{{ fileList }}" bind:after-read="afterRead" bind:delete="deleteImg">
    <image src="{{info.url}}" mode="widthFix" alt="" wx:if="{{ fileList.length === 0 }}"></image>
    <view class="position-absolute idCard-absolute" wx:if="{{ fileList.length === 0 }}">
      <van-icon name="photograph" color="#1989fa" size="20" />
      <view class="font-size-12 font-weight-600">{{info.text}}</view>          
    </view>
  </van-uploader>