cover–view中的button在手机上预览不显示

<cover-view class=“padding flex justify-center align-center”>

     <button class=“cu-btn round lg bg-black cuIcon-scan scan” bindtap=‘scan’>扫码用车</button>

   </cover-view>

   <cover-view class=“padding flex justify-end”>

     <button class=“cu-btn round location” bindtap=‘onLoad’>

       <image src=‘/images/location.png’ mode=“widthFix”></image>

     </button>

   </cover-view>

电脑：

手机：