内容页面（最终页面）loop循环第一个加高亮样式问题

    {loop $duotu $pic}

                    <div class="item {if $key_t==0} active {/if}">  

                    \\或者 <div class="item {if $key_pic==0} active {/if}">

                        <img src="{dr_thumb($pic.file, 640, 360)}" alt="" />
                        <div class="carousel-caption">
                            <h4></h4>
                            <p></p>
                        </div>
                    </div>
    {/loop}