用bootstrap建站时用到幻灯片切换模块，里面有个active(下面代码中的data-slide-to="0")，其余的按顺序递增（1,2），如果用dedecms就可以用autoindex来替代，如下图中的切换小圆点，点击不同的圆点会切换不同的banner图片
<div class="carousel slide" id="carousel-420353"> <ol class="carousel-indicators"> <li class="active" data-slide-to="0" data-target="#carousel-420353"> </li> <li data-slide-to="1" data-target="#carousel-420353"> </li> <li data-slide-to="2" data-target="#carousel-420353"> </li> </ol> <div class="carousel-inner"> <div class="item active"> <img alt="" src="*/default1.jpg" /> </div> <div class="item"> <img alt="" src="*/default2.jpg" /> </div> <div class="item"> <img alt="" src="*/default3.jpg" /> </div> </div>
<a class="left carousel-control" href="#carousel-420353" data-slide="prev"><span class="glyphicon glyphicon-chevron-left"></span></a>
<a class="right carousel-control" href="#carousel-420353" data-slide="next"><span class="glyphicon glyphicon-chevron-right"></span></a> </div>
如果用上面的代码，要是更换活动时就得每次去修改代码，我们可以将活动设置为栏目文章进行调用，通过修改后的代码如下
<div class="carousel slide" id="carousel-420353"> <ol class="carousel-indicators"> {dede:arclist row="1" typeid="3" flag='h' channelid='17'} <li class="active" data-slide-to="0" data-target="#carousel-420353"> </li> {/dede:arclist} {dede:arclist row="3" typeid="3" noflag='h' channelid='17'} <li data-slide-to="[field:global.autoindex/]" data-target="#carousel-420353"> </li> {/dede:arclist} </ol> <div class="carousel-inner"> {dede:arclist row="1" typeid="3" flag='h' channelid='17'} <div class="item active"> <img alt="[field:title /]" src="[field:picname /]" /> </div> {/dede:arclist} {dede:arclist row="3" typeid="3" noflag='h' channelid='17'} <div class="item"> <img alt="[field:title /]" src="[field:picname /]" /> </div> {/dede:arclist} </div> <a class="left carousel-control" href="#carousel-420353" data-slide="prev"><span class="glyphicon glyphicon-chevron-left"></span></a> <a class="right carousel-control" href="#carousel-420353" data-slide="next"><span class="glyphicon glyphicon-chevron-right"></span></a> </div>
active我们用头条标签(h)进行定义，其余用noflag来设置，这样就可以比较完美的调用了，感兴趣的朋友可以试试，也欢迎和ytkah交流
![Elastic：doc[‘field‘].value与params._source[‘field‘]的区别；doc循环依赖问题](https://ucc.alicdn.com/images/user-upload-01/f2fa687cb21f4969bd197171c6a3cc68.png?x-oss-process=image/resize,h_160,m_lfit)