<camera class="camera" wx:if="{{!show}}" device-position="back" flash="off" binderror="error">
  <cover-view class="id_m">
    <cover-image class="img"  src="../../../images/front.png"></cover-image>
  </cover-view>
  <view>
    <text  class="remarkshoot">请拍摄身份证正面</text>
  </view>
</camera>