xuezichuangke/pages/poster/poster.wxml

<view class="box">
  <image src="{{img}}weapp/poster1.png" style="width:100%;height:100%;" bindlongpress="saveImg"></image>
  <image src="{{erweima}}" style="width:280rpx;height:280rpx;" class="position"></image>
  <!-- <image src="{{poster}}" style="width:100%;height:100%;" bindtap='previewImage'></image> -->
</view>