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Copy path放大镜案例.html
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放大镜案例.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
padding: 0;
margin: 0;
}
.container {
display: flex;
padding: 50px;
}
.container .left {
position: relative;
width: 300px;
height: 300px;
border: 1px solid #ccc;
cursor: move;
}
.left>.move {
display: none;
position: absolute;
left: 0;
top: 0;
width: 200px;
height: 200px;
background-color: yellow;
opacity: 0.4;
}
.left>img {
width: 100%;
}
.container .right {
position: relative;
display: none;
width: 500px;
height: 500px;
border: 1px solid #ccc;
overflow: hidden;
background-color: skyblue;
}
.right>img {
position: absolute;
left: 0;
top: 0;
}
</style>
</head>
<body>
<div class="container">
<div class="left">
<img src="./img/iphone_small.jpg" alt="">
<p class="move"></p>
</div>
<div class="right">
<img class="right-img" src="./img/iphone_big.jpg" alt="">
</div>
</div>
<script>
// debugger
"use strict";
/*
1.在鼠标还没有放到左边框时，黄色盒子隐藏，右边的盒子也隐藏；
2.在鼠标放到左边的边框时，黄色盒子显示，右边的盒子也显示
需要用到的事件mouseover，mouseout
3.鼠标在左侧的边框移动时，黄色边框也要跟着移动
*/
const leftEle = document.querySelector('.left');
const moveEle = document.querySelector('.move');
const rightEle = document.querySelector('.right');
const rightImg = rightEle.firstElementChild;
magnifyingGlass({
leftEle,
moveEle,
rightEle,
rightImg
});
function magnifyingGlass({ leftEle, moveEle, rightEle, rightImg }) {
// 放大镜功能
// 鼠标移进
leftEle.addEventListener('mouseover', (ev) => {
moveEle.style.display = 'block';
rightEle.style.display = 'block';
const offsetLeft = ev.currentTarget.offsetLeft;
const offsetTop = ev.currentTarget.offsetTop;
const maxWidth = leftEle.offsetWidth - moveEle.offsetWidth; // 获取左侧盒子和黄色黄色之间的宽度差，作为可以x轴的移动最大值
const maxHeight = leftEle.offsetHeight - moveEle.offsetHeight;
let left = 0;
let top = 0;
ev.target.addEventListener('mousemove', (ev) => {
left = ev.clientX - (moveEle.offsetWidth / 2) - offsetLeft; // 黄色遮罩层X轴可以移动数值
top = ev.clientY - (moveEle.offsetHeight / 2) - offsetTop;
// 下面的if 语句是用来设置移动范围的，不允许超过
if (left <= 0) {
left = 0;
}
if (left >= maxWidth) {
left = maxWidth;
}
if (top <= 0) {
top = 0;
}
if (top >= maxHeight) {
top = maxHeight;
}
moveEle.style.left = `${left}px`;
moveEle.style.top = `${top}px`;
// 右侧图片移动比例距离计算，rightImg.offsetWidth - rightEle.offsetWidth 这条式子是计算右侧盒子和图片的大小差距，那个差值作为移动的最大值
rightImg.style.left = `-${(rightImg.offsetWidth - rightEle.offsetWidth) * left / maxWidth}px`;
rightImg.style.top = `-${(rightImg.offsetHeight - rightEle.offsetHeight) * top / maxHeight}px`;
});
});
// 鼠标移出
leftEle.addEventListener('mouseout', (ev) => {
moveEle.style.display = 'none';
rightEle.style.display = 'none';
});
}
</script>
</body>
</html>