用javascript制作放大镜放大图片 时间:2020-05-11 人气:1 <html> <head> <title>emu</title> </head> <body> 原图： <img onerror="javascript:this.src='/skin1/img/error.jpg';" src=https://img.qb5200.com/download-x/20200511/26388.gif width="280" height="150" id=srcImg onmousemove="zoom()"> 局部放大图： <div><img onerror="javascript:this.src='/skin1/img/error.jpg';" id=zoomImg></div> <script LANGUAGE="JavaScript"> <!-- zoomImg.src = srcImg.src; srcImg.height = srcImg.height/2; var zoomRate = 5; //放大倍数 zoomImg.height = srcImg.height*zoomRate; zoomImg.parentNode.style.width = srcImg.width; zoomImg.parentNode.style.height = srcImg.height; function zoom(){ var elm = event.srcElement; h = elm.offsetHeight/zoomRate/2; w = elm.offsetWidth/zoomRate/2; var x = event.x-elm.offsetLeft; x=x<(elm.offsetWidth-w)?x<w?w:x:elm.offsetWidth-w; zoomImg.style.marginLeft=(w-x)*zoomRate; var y = event.y-elm.offsetTop; y=y<(elm.offsetHeight-h)?y<h?h:y:elm.offsetHeight-h; zoomImg.style.marginTop=(h-y)*zoomRate; } //--> </script> </body> </html> [Ctrl+A 全选 注:如需引入外部Js需刷新才能执行] 加载全部内容