javascript实现图片自动和可控的轮播切换特效

<script type="text/javascript">
Qfast.add('widgets', { path: "http://hovertree.com/texiao/js/1/js/terminator2.2.min.js", type: "js", requires: ['fx'] });
Qfast(false, 'widgets', function () {
K.tabs({
id: 'decoroll2', //焦点图包裹id
conId: "decoimg_a2", //大图域包裹id
tabId: "deconum2", //小圆点数字提示id
tabTn: "a",
conCn: '.decoimg_b2', //大图域配置class
auto: 1, //自动播放 1或0
effect: 'fade', //效果配置
eType: 'mouseover', // 鼠标事件
pageBt: true, //是否有按钮切换页码
bns: ['.prev', '.next'], //前后按钮配置class
interval: 3000// 停顿时间
})
})
</script>

<div id="decoroll2" class="imgfocus">
<div id="decoimg_a2" class="imgbox">
<div class="decoimg_b2">
<a href="https://www.jb51.net">
<img src="/texiao/js/1/img/1.jpg">
</a>
</div>
<div class="decoimg_b2">
<a href="https://www.jb51.net">
<img src="/texiao/js/1/img/2.jpg">
</a>
</div>
<div class="decoimg_b2">
<a href="https://www.jb51.net">
<img src="/texiao/js/1/img/3.jpg">
</a>
</div>
<div class="decoimg_b2">
<a href="https://www.jb51.net">
<img src="/texiao/js/1/img/4.jpg">
</a>
</div>
</div>
<ul id="deconum2" class="num_a2">
<li><a href="javascript:void(0)" hidefocus="true" target="_self">杨幂</a></li>
<li><a href="javascript:void(0)" hidefocus="true" target="_self">范冰冰</a></li>
<li><a href="javascript:void(0)" hidefocus="true" target="_self">高圆圆</a></li>
<li><a href="javascript:void(0)" hidefocus="true" target="_self">刘诗诗</a></li>
</ul>
</div>