combination/miniprogram/packageExtend/pages/adapt/freelayout/freelayout.wxml

<view class="container page" data-weui-theme="{{theme}}">
  <view class="flexbox">
    <mp-row>
      <mp-col xs="{{24}}" span="{{0}}">
        <view>
          <view class="item item-A">
            A
          </view>
        </view>
      </mp-col>
      <mp-col xs="{{24}}" span="{{0}}">
        <view>
          <view class="item item-B">
            B
          </view>
        </view>
      </mp-col>
      <mp-col xs="{{24}}" span="{{0}}">
        <view>
          <view class="{{theme === 'dark' ? 'item dark-C' : 'item item-C'}}">
            C
          </view>
        </view>
      </mp-col>
    </mp-row>
    <!-- 宽屏左右布局 -->
    <mp-row>
      <mp-col xs="{{0}}" span="{{16}}">
       <mp-row>
        <mp-col>
           <view>
            <view class="item item-A">
              A
            </view>
          </view>
        </mp-col>
        <mp-col>
           <view>
            <view class="item item-B">
              B
            </view>
          </view>
        </mp-col>
       </mp-row>
      </mp-col>
      <mp-col xs="{{0}}" span="{{8}}">
          <view>
            <view class="{{theme === 'dark' ? 'item dark-C' : 'item item-C'}}" style="height: 490px; line-height:480px;">
              C
            </view>
          </view>
        </mp-col>
    </mp-row>
  </view>
</view>