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JS实现放大镜效果

程序员文章站 2022-07-06 16:04:05
js实现放大镜效果,供大家参考,具体内容如下鼠标移到图片上就可以放大一块区域代码: &...

js实现放大镜效果,供大家参考,具体内容如下

鼠标移到图片上就可以放大一块区域

代码:

<!doctype html>
<html lang="en">
 <head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>document</title>
  <style>
   #small{
    width: 700px;
    height: 340px;
    position: absolute;
    left: 70px;
    top: 100px;
   }
   #small img{
    width: 100%;
    height: 100%;
   }
   #mark{
    width: 200px;
    height: 200px;
    background-color:white;
    position: absolute;
    opacity: 0.5;
    filter: alpha(opacity=50);
    left: 0px;
    top: 0px;
    display: none;
   }
   #big{
    width: 400px;
    height: 400px;
    border: 1px solid black;
    left: 800px;
    top: 100px;
    position: absolute;
    overflow: hidden;
    display: none;
   }
   #big img{
    width: 1400px;
    height: 680px;
    position: absolute;
    left: 0px;
    top: 0px;
   }
  </style>
  <script>
   window.onload = function(){
    var osmall = document.getelementbyid("small");
    var obig = document.getelementbyid("big");
    var omark = document.getelementbyid("mark");
    var obigimg = obig.getelementsbytagname("img")[0];

    osmall.onmouseover = function(){
     omark.style.display = "block";
     obig.style.display = "block";
    }
    osmall.onmouseout = function(){
     omark.style.display = "none";
     obig.style.display = "none";
    }
    osmall.onmousemove = function(ev){
     var e = ev || window.event;
     var l = e.clientx - osmall.offsetleft - 100;
     if(l <= 0){
      l = 0;
     }
     if(l >= (700-200)){
      l = 500;
     }
     var t = e.clienty - osmall.offsettop - 100;
     if(t <= 0){
      t = 0;
     }
     if(t >= (340-200)){
      t = 140;
     }
     omark.style.left = l + 'px';
     omark.style.top = t + 'px';

     /* 右边图片移动方向与左边图片方向相反且成倍数移动 */
     obigimg.style.left = l * -2 + 'px';
     obigimg.style.top = t * -2 + 'px';

    }
   }
  </script>
 </head>
 <body>
  <div id="small">
   <img src="地狱之门卫士 加里奥.jpg" alt="怎么回事">
   <div id="mark"></div>
  </div>
  <div id="big">
   <img src="地狱之门卫士 加里奥.jpg" alt="怎么回事">
  </div>
 </body>
</html>

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。

相关标签: js 放大镜