JS版图片放大镜效果

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        *{
            padding:0;
            margin:0;
        }
        .box{
            position: relative;
            width:350px;
            height:510px;
            margin:auto;
        }
        .middle {
            position: relative;
            border: 1px solid pink;
            overflow: hidden;

        }
        .hover_ceng{
            position: absolute;
            z-index: 1;
            background: url(./img/bg.png);
            background-size: 4px 4px;
            display: none;

        }
        .middle >img{
            width:100%;
            height:100%;
        }

        .small{
            position: relative;
            width:350px;
            height:110px;
            text-align: center;
        }
        .small>span{
            position: absolute;
            display:block;
            top:15px;
            line-height: 50px;
            font-size: 20px;
            width:20px;
            height:50px;
            background: #eabcb8;
        }
        .small .leftbtn {
            left: 0;
        }
        .small .rightbtn {
            right: 0;
        }
        .small>.list>ul> li{
            list-style:none ;
            float:left;
            width:250px;
        }
        .list{
            width:250px;
            display:inline-block;
            text-align: left;
            overflow: hidden;
        }
        .list_ul{
            width:500px;
            overflow: hidden;
            height:auto;
            transition: all 0.5s linear ;
        }
        .small-li{
            display: inline-block;
            width:54px;
            height:58px;
            margin:10px 0;
            border:2px solid transparent;
        }
        .small-li> img{
            width:100%;
            height:100%;
        }

        .big{
            position: absolute;
            top:0;
            left:350px;
            height:400px;
            width:350px;
            border:1px solid gainsboro;
            background-image: url(./img/big8.jpg);
            /*background-size: 350px 400px;*/
            display: none;
            /*background-repeat: no-repeat ;*/
        }

    </style>
</head>
<body>
 <div class="box" >
     <div class="middle" style=" width:350px;height:400px;">
         <div class="hover_ceng" style="  width:153.508px;height:200px;"></div>
         <img  id="middleimg" src="./img/middle.5.jpg" alt=""/>
     </div>
     <div class="small">
         <span class="leftbtn"><</span>
         <div class="list">
           <ul class="list_ul">
            <li>
                 <div class="small-li" data-middle="middle.5.jpg" data-big="big5.jpg">
                     <img src="./img/small5.jpg"   alt=""/>
                 </div>
                 <div class="small-li"  data-middle="middle.6.jpg" data-big="big6.jpg">
                     <img src="./img/small6.jpg"  alt=""/>
                 </div>
                 <div class="small-li"  data-middle="middle.7.jpg" data-big="big7.jpg">
                     <img src="./img/small7.jpg"  alt=""/>
                 </div>
                 <div class="small-li" data-middle="middle.8.jpg" data-big="big8.jpg">
                     <img src="./img/small8.jpg"   alt=""/>
                 </div>
            </li>
            <li>
               <div class="small-li" data-middle="middle.1.jpg" data-big="big1.jpg">
                   <img src="./img/small1.jpg"   alt=""/>
               </div>
               <div class="small-li"  data-middle="middle.2.jpg" data-big="big2.jpg">
                   <img src="./img/small2.jpg"  alt=""/>
               </div>
               <div class="small-li"  data-middle="middle.3.jpg" data-big="big3.jpg">
                   <img src="./img/small3.jpg"  alt=""/>
               </div>
               <div class="small-li" data-middle="middle.4.jpg" data-big="big4.jpg">
                   <img src="./img/small4.jpg"   alt=""/>
               </div>
            </li>
           </ul>
         </div>
         <span class="rightbtn">> </span>
     </div>
     <div class="big">
         <!--<img src="./img/big6.jpg" alt=""/>-->
     </div>
 </div>
 <script>
     var smallblack=document.getElementsByClassName("small-li");
     var middleimage=document.getElementById("middleimg");
     var middleblock=document.getElementsByClassName("middle")[0];
     var ceng=document.getElementsByClassName("hover_ceng")[0];
     var box_b=document.getElementsByClassName("box")[0];
     var bigbang=document.getElementsByClassName ("big")[0];
     var leftbutton=document.getElementsByClassName ("leftbtn")[0];
     var rightbutton=document.getElementsByClassName ("rightbtn")[0];
     var listmeun=document.getElementsByClassName ("list_ul")[0];
      var befortu=null;
     for(var i =0;i<smallblack.length;i++){
         smallblack[i].onmouseenter=function(){
             if(befortu)befortu.style.borderColor="transparent";
             this.style.borderColor="pink";
             befortu =this;
             //中等图出现
             middleimage.src="./img/" +  this.getAttribute("data-middle");
             //获取大图
              bigbang.style.backgroundImage="url(./img/"+this.getAttribute('data-big')+")";
         }
     }
  //添加鼠标进入事件var

     middleblock.onmouseenter=function(){
      this.style.cursor ="move";
      ceng.style.display ="block";
      bigbang.style.display ="block";
     }
     middleblock.onmouseleave=function(){
         ceng.style.display="none";
         bigbang.style.display ="none";
     }
     middleblock.onmousemove =function(m){
         var pageX = m.pageX || m.clientX;
         var pageY = m.pageY || m.clientY;
         //获取当前元素的偏移量  offsetLeft  左偏移   offsetTop  上偏移 this.offsetHeight,this.offsetWidth
       pageX = pageX -(box_b.offsetLeft+parseInt (ceng.style.width)/2);
       pageY = pageY -(box_b.offsetTop+parseInt (ceng.style.height)/2);
         var bigleft=parseInt (this.style.width) - parseInt (ceng.style.width);
         var bigtop=parseInt (this.style.height) - parseInt (ceng.style.height);
         pageX = pageX <=0 ? 0:(pageX >=bigleft? bigleft :pageX );
         pageY = pageY <=0 ? 0:(pageY >=bigtop? bigtop :pageY );
         ceng.style.left= pageX +"px";
         ceng.style.top= pageY +"px";
         //鼠标移动大图跟着移动
        bigbang.style.backgroundPosition = (-pageX * 2.28) + "px " + (-pageY * 2) + "px ";

     }
     leftbutton.onclick = function(){
         listmeun.style.marginLeft =0+"px";
     }
    rightbutton.onclick = function(){
         listmeun.style.marginLeft =-250+"px";
     }
 </script>
</body>
</html>

最大的图没能从原网站上下载下来,放大效果可能会出戏,小菜鸟,还得学习扒拉图片。

AE1052EA-B886-2E2B-EC2A-0899B858766B.png

FAA214D3-A530-E4ED-2E2B-85E4628BC5C9.png

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