app/components/popup3/popup.wxml

<view class="data-popup" hidden="{{flag}}">
  <view class="data-popup-container">
    <image src="{{appAssetsUrl2}}wjxy/close.png" class='popup-close' bindtap="_error"></image>
    <view class="popup-main">
      <view class="popup-title">{{title}}</view>
      <view class="popup-content">
        <slot name="content"></slot>
      </view>
      <view class="popup-footer">
        <button wx:if="{{!self}}" bindtap='_success' class="btn">{{btn_ok}}</button>
        <block wx:else>
          <slot name="footer"></slot>
        </block>
      </view>
    </view>
  </view>
</view>