flex.wxml

<view >
    <view class="flex-row" style="display: flex;flex-direction: row">
        <view class="flex-view-item">1</view>
        <view class="flex-view-item">2</view>
        <view class="flex-view-item">3</view>

    </view>

   
    <view class="flex-column" style="display:flex;flex-direction: column;" >
        <view class="flex-view-item">1</view>
        <view class="flex-view-item">2</view>
        <view class="flex-view-item">3</view>
        
    </view>
</view>