<view wx:for="{{array}}" wx:for-index="a" wx:for-item="b">

    {{a}}:{{b}}

</view>

<!-- 如果不设别名，默认是 item.index -->

<view wx:for="{{array}}">

    {{index}}:{{item}}

</view>

<view wx:if="{{item.fileFile}}">

  <block wx:for="{{item.fileFile}}" wx:key="*this" wx:for-item="fileFile">

    <view bindtap="downdFile" class="info">

      fileFile:{{fileFile}}

      fileFile:{{item.fileFile[index]}}

      filename:{{item.filename[index]}}

    </view>

  </block>

</view>