아코디언 그림 전환 케이스의 JavaScript 구현

(function(){
var con = document.getElementsByClassName('hm_icr_tr')[0];  //包裹层盒子
var aSpan = con.getElementsByClassName('hmii_item_chover'); //点击交互处盒子
var items = con.getElementsByClassName('hm_itr_item'); //每个运动的大盒子
var contents = con.getElementsByClassName('hmii_item_content');  //运动大盒子里面的文本内容
var clickIndex = 0;

for(var i=0;i<aSpan.length;i++)
{
    aSpan[i].index = i;
    aSpan[i].onmouseover = function(){

        //确定点的顺序
        clickIndex = this.index;
        for(var j=0;j<items.length;j++)
        {
            items[j].style.width = 30 + &#39;px&#39;;
            contents[j].style.transition = &#39;0s&#39;;
            contents[j].style.opacity = 0;
            aSpan[j].style.opacity = 1;
        }

        //盒子
        items[this.index].style.width = 160 + &#39;px&#39;;

        //当前点击块
        this.style.opacity = 0;
    }
}

//运动结束事件监听
for(var i=0;i<items.length;i++)
{
    items[i].num = i;
    items[i].addEventListener(&#39;transitionend&#39;, function(ev){
       console.log(clickIndex);
       contents[clickIndex].style.transition = &#39;.8s&#39;;
       contents[clickIndex].style.opacity = &#39;1&#39;;
    });
} 
})();