本文使用的是400*300分辨率的图片,重要部分的思路都在代码注释里，如果还有不懂得地方，请留言，必回！代码如下:
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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>CSS实现截图和放大镜</title>
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<style>
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*{
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padding:0;
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margin:0;
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}
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#view1{
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width: 400px;
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height: 300px;
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position: absolute;
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/*top:100px;
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left:200px;*/
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}
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#view2{
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width: 400px;
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height: 300px;
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position: absolute;
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left:450px;
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display: none;
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}
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#view2 img{
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width: 100%;
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}
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#magnifier{
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position: absolute;
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width: 80px;
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height: 60px;
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border:1px solid red;
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left: 160px;
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top: 110px;
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cursor: pointer;
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display: none;
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}
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</style>
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</head>
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<body>
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<p id="intend"></p>
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<div id="view1">
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<img src="images/2.jpg" alt="">
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<div id="magnifier"></div>
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</div>
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<div id="view2">
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<img src="images/2.jpg" alt="">
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</div>
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<script>
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window.onload=function(){
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var view=document.getElementById('view1');
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var view_mag=document.getElementById('view2');
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var inner=document.getElementById("intend");
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var magnifier=document.getElementById("magnifier");
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view.addEventListener('mouseover',function(){magnifier.style.display="block";},true);
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view.addEventListener('mouseout',function(){magnifier.style.display="none";
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view_mag.style.display="none";},true);//给view增加鼠标移出监听事件
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view.onmousemove=function(){
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var e=e||window.event;
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var mouseX=e.clientX;//获得鼠标横坐标
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var mouseY=e.clientY;//获得鼠标纵坐标
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var magL=e.clientX-40;
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var magT=e.clientY-30;
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if(magL<0){magL=0}//不让之溢出
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if(magL>320){magL=320}
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if(magT<0){magT=0}
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if(magT>240){magT=240}
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magnifier.style.top=magT+"px";//鼠标滑动时放大镜的位置坐标
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magnifier.style.left=magL+"px";
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// inner.innerHTML=mouseX+" "+mouseY;
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view_mag.style.display="block";
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view_mag.style.clip="rect("+magT+"px"+","+(magL+80)+"px"+","+(magT+60)+"px"+","+magL+"px"+")";
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//**clip:rect(top,width,height,left),clip为CSS截图属性,(top,left)为所截图的左上角坐标,(width-left,height-top)分别为所截图的宽和高**
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//1:1放大镜
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// view_mag.style.zoom=1;//正常比例
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// view_mag.style.left=(450-magL)+"px";//放大后的图片在固定位置显示,magL为显示的区域的左上角横坐标
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// view_mag.style.top=-magT+"px";//magT为显示区域的左上角纵坐标
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// //1:2放大镜
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// view_mag.style.zoom=2;
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// view_mag.style.left=450/2-magL+"px";
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// view_mag.style.top=-magT+"px";
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// //1:3放大镜
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// view_mag.style.zoom=3;
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// view_mag.style.left=450/3-magL+"px";
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// view_mag.style.top=-magT+"px";
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// //1:4放大镜
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// view_mag.style.zoom=4;
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// view_mag.style.left=450/4-magL+"px";
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// view_mag.style.top=-magT+"px";
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//1:5放大镜
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view_mag.style.zoom=5;
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view_mag.style.left=450/5-magL+"px";
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view_mag.style.top=-magT+"px";
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}
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}
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</script>
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</body>
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</html>
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