画廊效果

 <style>
        *{margin: 0;padding:0}
        .small-icons img{
            width: 116px;
            height: 116px;
        }
        .current{
            border:2px solid red;
        }
        .content img{
            height: 500px;
            width: 600px;
            border: 2px solid red;
        }
    </style>

 <div class="small-icons">
        <img src="images/01.jpg" alt="" class="current">
        <img src="images/02.jpg" alt="">
        <img src="images/03.jpg" alt="">
        <img src="images/04.jpg" alt="">
        <img src="images/05.jpg" alt="">
    </div>
    <div class="content">
        <img src="images/01.jpg" alt="" class="current">
    </div>
    <script>
       var icons=document.querySelectorAll(".small-icons>img");
       var show=document.querySelectorAll(".content>img")[0];
        for(let i=0;i<icons.length;i++){
            icons[i].index=i;
            icons[i].onclick=function(){
              for(let i=0;i<icons.length;i++){
                  icons[i].classList.remove("current")   //其余的都移出current
               }
              this.classList.add("current")   //当前增加一个current
              var index=this.index;   //将当前下标给index
              show.src=`images/0${index+1}.jpg`   //图片从01开始,index从0开始,所以index要+1
            }
        }
    </script>