原生HTML放大镜

该放大区域用背景图片放大

DOCTYPE html>
<html lang="zh">
	<head>
		<meta charset="UTF-8">
		<meta name="viewport" content="width=device-width, initial-scale=1.0">
		<meta http-equiv="X-UA-Compatible" content="ie=edge">
		<title>title>
		<style type="text/css">
			body {
				height: 1200px;
				background-color: lightskyblue;
			}

			ul {
				margin: 0;
				padding: 0;
				list-style: none;
			}

			.itemarea {
				position: relative;
				width: 500px;
				height: 680px;
				border: 1px black solid;
				margin: 50px auto;
			}

			.itemarea .pic {
				margin-bottom: 15px;
			}

			.itemarea img {
				width: 500px;
				height: 600px;

			}

			.itemarea .pic .cover {
				position: absolute;
				left: 0;
				top: 0;
				width: 200px;
				height: 200px;
				background-image: url(img/7.png);
				opacity: 0.6;
				display: none;
			}

			.itemarea .list {
				display: flex;

			}

			.itemarea .list li {
				margin: auto;
			}

			.itemarea .list img {
				display: block;
				width: 50px;
				height: 50px;
			}

			.itemarea .detail {
				position: absolute;
				top: 0;
				left: 500px;
				/* 此处为放大2倍,显示框的大小是遮阴框宽高的2倍 */
				width: 400px;
				height: 400px;
				display: none;
				border: 1px black solid;
				background: url(img/1.PNG);
				/* 此处放大2倍,背景图片的宽高是左边显示图片的2倍 */
				background-size: 1000px 1200px;
				/* background-size: 200%; 或者这样写*/

			}

			.itemarea .list .current {
				border: 2px green solid;
			}
		style>
	head>
	<body>
		<div class="itemarea">
			<div class="pic">
				<img src="img/1.PNG">
				<div class="cover">div>
			div>
			<ul class="list">
				<li><img src="img/1.PNG">li>
				<li><img src="img/2.PNG">li>
				<li><img src="img/3.PNG">li>
				<li><img src="img/4.PNG">li>
				<li><img src="img/5.PNG">li>
				<li><img src="img/6.PNG">li>
			ul>
			<div class="detail">

			div>
		div>
		<script type="text/javascript">
			/* 
		 需求
		 1,鼠标放入图片时候,会动态修改图片地址
		 2,鼠标放入大图,会动态修改右边图片位置
		 2.1显示图片的放大镜,
		 2.2显示右边效果
		 */
			var itemarea = document.querySelector(".itemarea");
			var list = document.querySelector(".list");
			/* 上面的大图片 */
			img = document.querySelector(".pic img");
			/* 所有的图片 */
			imgs = list.querySelectorAll("img");
			/* 主图片展示区域 */
			pic = document.querySelector(".itemarea .pic");
			/* 放大镜 */
			cover = document.querySelector(".cover");
			/* 放大的区域 */
			detail = document.querySelector(".detail");
			/* 监听事件,切换图片src */
			list.addEventListener("mousemove", function(e) {
				if (e.target.tagName == "IMG") {
					img.src = e.target.src;
					detail.style.backgroundImage = "url(" + e.target.src + ")";
					/* 遍历 所有边框都为空*/
					imgs.forEach(function(item) {
						item.className = "";
					})
					/* 选中的改变边框颜色*/
					e.target.className = "current";
				}
			})
			pic.addEventListener("mousemove", function(e) {
				/* 放大镜距离浏览器的距离 */
				var x = e.clientX;
				y = e.clientY;
				/* 图片框距离浏览器的距离 */
				cx = pic.getBoundingClientRect().left;
				cy = pic.getBoundingClientRect().top;
				tx = x - cx - 100;
				ty = y - cy - 100;
				if (tx < 0) {
					tx = 0;
				}
				if (ty < 0) {
					ty = 0;
				}
				/* 显示图片宽-遮阴框的宽 */
				if (tx >300) {
					tx = 300;
				}
				/* 显示图片高-遮阴框的高 */
				if (ty > 400) {
					ty = 400;
				}
				cover.style.left = tx + "px";
				cover.style.top = ty + "px";
				/* 根据遮阴框在盒子的移动距离百分比------对应放映框在大图片的移动距离百分比 */
				/*    tx,ty/遮阴框的极限范围 */
				detail.style.backgroundPosition = tx / 300 * 100 + "%" + ty / 400 * 100 + "%";
			})
			/* 移除隐藏 */
			itemarea.onmouseout = function() {
				cover.style.display = "none";
				detail.style.display = "none"
			}
			itemarea.onmouseover = function() {
				cover.style.display = "block";
				detail.style.display = "block";
			}
		script>
	body>
html>

效果如下:

原生HTML放大镜_第1张图片

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