用js制作淘宝放大镜效果

时间：2021-05-18

本文实例为大家分享了js制作淘宝放大镜效果的具体代码，供大家参考，具体内容如下

<!DOCTYPE html><html> <head> <meta charset="UTF-8"> <title></title> <style type="text/css"> *{ margin: 0; padding: 0; } img{ width: 100%; height: 100%; } #content{ width: auto; height: auto; margin-left: 200px; margin-top: 60px; } #content-left{ position: relative; width: 420px; height: auto; float: left; } #middle{ border: 1px solid #d2d2d2; width: 418px; height: 418px; } #small{ width: 420px; height: auto; } #glass{ position: absolute; width: 200px; height: 200px; background-color: pink; top: 0; opacity: 0.5; z-index: 1; display: none; } ul{ width: inherit; height: 60px; } ul li{ display: inline; height: 60px; list-style: none; float: left; margin: 10px; } #content-right{ position: relative; width: 418px; height: 418px; border: 1px solid #ccc; float: left; margin-left: 10px; overflow: hidden; display: none; } #content-right img{ position: absolute; width: 836px; height: 836px; } </style> </head> <body> <div id="content"> <div id="content-left"> <div id="middle"> <div id="glass"></div> <img src="img/01.jpg"/> </div> <div id="small"> <ul> <li><img src="img/1.jpg"/></li> <li><img src="img/2.jpg"/></li> <li><img src="img/3.jpg"/></li> <li><img src="img/4.jpg"/></li> <li><img src="img/5.jpg"/></li> </ul> </div> </div> <div id="content-right"> <img src="img/001.jpg"/> </div> </div> </body> <script type="text/javascript"> var smallLi = document.getElementById("small").getElementsByTagName("ul")[0].getElementsByTagName("li"); var middle = document.getElementById("middle") var middleImg = middle.getElementsByTagName("img")[0] var contentRight = document.getElementById("content-right"); var bigImg = contentRight.getElementsByTagName("img")[0] var glass = document.getElementById("glass"); //获取放大镜大小 var bigImgWidth = getStyle(bigImg,"width"); var bigImgHeight = getStyle(bigImg,"height"); var contentRightWidth = getStyle(contentRight,"width"); var contentRightHeight = getStyle(contentRight,"height"); var middleWidth = getStyle(middle,"width"); var middleHeight = getStyle(middle,"height"); var glassWidth = contentRightWidth/bigImgWidth*middleWidth; var glassHeight = contentRightHeight/bigImgHeight*middleHeight; var middleBorder = getStyle(middle,"border") glass.style.width = glassWidth + "px"; glass.style.height = glassHeight + "px"; for(var i =0;i<smallLi.length;i++){ (function(index){ smallLi[i].onmouseover = function(){ middleImg.src = "img/0"+index+".jpg"; bigImg.src = "img/00"+index+".jpg" } })((i+1)); } middle.onmouseover = function(){ contentRight.style.display = "block" glass.style.display = "block" middle.onmousemove = function(ev){ var evt = ev||event var x = evt.x - content.offsetLeft -glass.offsetWidth/2 + window.scrollX - middleBorder var y = evt.y - content.offsetTop - glass.offsetHeight/2 + window.scrollY - middleBorder if(x<=middleBorder){ x = middleBorder; } if(x>=middle.offsetWidth-glass.offsetWidth-middleBorder){ x = middle.offsetWidth - glass.offsetWidth -middleBorder; } if(y<=middleBorder){ y = middleBorder; } if(y>=middle.offsetHeight-glass.offsetHeight-middleBorder){ y = middle.offsetHeight - glass.offsetHeight - middleBorder; } glass.style.left = x + "px" glass.style.top = y + "px" bigImg.style.left = -x*middleWidth/glassWidth + middleBorder*2 + "px" bigImg.style.top = -y*middleHeight/glassHeight + middleBorder*2 + "px" console.log(x) console.log(x*middleWidth/glassWidth) } middle.onmouseout = function(){ contentRight.style.display = "none"; glass.style.display = "none"; } } function getStyle(obj,attr){//获取css属性 return (obj.currentStyle)?parseInt(obj.currentStyle[attr]):parseInt(getComputedStyle(obj,false)[attr]); } </script></html>

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