   </div>
    <div class="demo-item">
        <p class="demo-desc">flex布局排列，默认横排</p>
        <div class="demo-block">
            <div class="ui-flex ui-flex-pack-start">
                <div>左</div><div>左</div>
            </div>
            <div class="ui-flex ui-flex-pack-center">
                <div>中</div><div>中</div>
            </div>
            <div class="ui-flex ui-flex-pack-end">
                <div>右</div><div>右</div>
            </div>
            <div class="ui