本文实例为大家分享了javascript实现放大镜特效的具体代码,供大家参考,具体内容如下
我们在逛pc端商城时,鼠标放到商品上经常会看到一个类似放大镜效果的蒙层,
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<!DOCTYPE html> < html > < head > < meta charset = "UTF-8" > < title ></ title > < style type = "text/css" > * { margin: 0px; padding: 0px; } #min { width: 350px; height: 350px; border: 1px solid #ccc; position: absolute; left: 50px; top: 50px; } #min img { width: 350px; height: 350px; } #max { width: 500px; height: 500px; position: absolute; left: 500px; top: 50px; border: 1px solid #ccc; overflow: hidden; display: none; } #max img { position: absolute; left: 0; top: 0; } #mask { width: 200px; height: 200px; background: rgba(255, 0, 0, 0.5); position: absolute; left: 0px; top: 0px; cursor: pointer; display: none; } </ style > </ head > < body > < div id = "min" > < img src = "img/min.jpg" alt = "" /> < div id = "mask" ></ div > </ div > < div id = "max" > < img src = "img/max.jpg" id = "maxImg" /> </ div > < script type = "text/javascript" > // 1.鼠标经过小盒子,遮罩层出现,大盒子出现 // 2.遮罩层跟随鼠标移动 // 3.遮罩层移动,大盒子里的图片反方向移动 var oMin = document.getElementById('min'); var oMax = document.getElementById('max'); var oMask = document.getElementById('mask'); var oMaxImg = document.getElementById('maxImg'); oMin.onmousemove = function(e) { // 1.鼠标经过小盒子,遮罩层和大盒子出现 oMask.style.display = 'block'; oMax.style.display = 'block'; // 2.拿到鼠标在小盒子上的坐标 var minX = e.clientX - oMin.offsetLeft; var minY = e.clientY - oMin.offsetTop; // 3.将鼠标放置在遮罩层的中间 minX = minX - oMask.offsetWidth / 2; minY = minY - oMask.offsetHeight / 2; // 4.遮罩层可以移动的最大距离 var maxWidth = oMin.offsetWidth - oMask.offsetWidth; var maxHeight = oMin.offsetHeight - oMask.offsetHeight; // 限定遮罩层的位置 if (minX > maxWidth) { minX = maxWidth; } else if (minX <= 0) { minX = 0; } if (minY > maxHeight) { minY = maxHeight; } else if (minY <= 0) { minY = 0; } // 设定遮罩层的偏移 oMask.style.left = minX + 'px'; oMask.style.top = minY + 'px'; // 大图片移动的距离=遮罩层移动的距离/遮罩层可以移动的最大距离*大图片最大移动距离 var ratioX = minX / maxWidth; var ratioY = minY / maxHeight; // 计算出大图片的移动距离 oMaxImg.style.left = -ratioX * (oMaxImg.offsetWidth - oMax.offsetWidth) + 'px'; oMaxImg.style.top = -ratioY * (oMaxImg.offsetHeight - oMax.offsetHeight) + 'px'; }; // 鼠标移开,遮罩层和大盒子消失 oMin.onmouseout = function() { oMask.style.display = 'none'; oMax.style.display = 'none'; } </ script > </ body > </ html > |
效果图:
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服务器之家。
原文链接:https://blog.csdn.net/weixin_45334111/article/details/110483842