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Copy path放大镜.html
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放大镜.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<style type="text/css">
* {
margin: 0;
padding: 0;
}
.normal {
width: 300px;
height: 300px;
position: relative;
}
.normal > img {
width: 100%;
height: 100%;
}
.lay {
width: 150px;
height: 150px;
background: orange;
opacity: 0.5;
position: absolute;
left: 0;
top: 0;
cursor: move;
display: none;
}
.big {
width: 300px;
height: 300px;
position: absolute;
left: 350px;
top: 0px;
overflow: hidden;
display: none;
}
.big > img {
width: 600px;
height: 600px;
position: absolute;
display: block;
}
</style>
</head>
<body>
<section id="magnifier"></section>
<script type="text/javascript">
var magnifier = {
init(param) {
const el = param.el;
const src = param.src;
if (!el || !src) return;
this.createElement(el, src);
},
createElement(el, src) {
const _this = this;
const normalDiv = document.createElement('div');
normalDiv.className = 'normal';
const normalImg = document.createElement('img');
normalImg.src = src.normal;
const normalSpan = document.createElement('span');
normalSpan.className = 'lay';
normalDiv.appendChild(normalImg);
normalDiv.appendChild(normalSpan);
const bigDiv = document.createElement('div');
bigDiv.className = 'big';
const bigImg = document.createElement('img');
bigImg.src = src.big;
bigDiv.appendChild(bigImg);
el.appendChild(normalDiv);
el.appendChild(bigDiv);
normalDiv.addEventListener('mouseover', () => {
// TODO: 放大镜、被放大的图片都显示，渲染为块级元素
normalSpan.style.display = 'block';
bigDiv.style.display = 'block';
});
normalDiv.addEventListener('mouseout', () => {
// TODO: 放大镜、被放大的图片都隐藏，不渲染
normalSpan.style.display = 'none';
bigDiv.style.display = 'none';
});
normalDiv.addEventListener('mousemove', _moveHandler);
function _moveHandler(event) {
event = event || window.event;
_this.moveHandler(event, normalDiv, normalSpan, bigImg);
}
},
moveHandler(event, normalDiv, normalSpan, bigImg) {
// tip: 该函数处理放大镜、被放大的图片的显示区域，x、y分别为鼠标在该模块中的位置坐标
const scale = 2;
let x = event.clientX - normalSpan.offsetWidth / 2;
let y = event.clientY - normalSpan.offsetHeight / 2;
// TODO: 判断临界值，重新设置放大镜、被放大的图片的位置
let xMin = 0;
let yMin = 0;
let xMax = normalDiv.offsetWidth - normalSpan.offsetWidth;
let yMax = normalDiv.offsetWidth - normalSpan.offsetWidth;
if (x < xMin) {
x = xMin;
} else if (x > xMax) {
x = xMax;
}
if (y < yMin) {
y = yMin;
} else if (y > yMax) {
y = yMax;
}
// console.log(x, y);
// console.log(normalSpan);
normalSpan.style.left = x + 'px';
normalSpan.style.top = y + 'px';
bigImg.style.left = -x * 2 + 'px';
bigImg.style.top = -y * 2 + 'px';
},
};
magnifier.init({
// TODO: 请获取id=magnifier的节点
el: document.getElementById('magnifier'),
src: {
normal:
'https://uploadfiles.nowcoder.com/images/20211201/920662346_1638327818015/FE8B1A979ADF6E3C2C114AF3F9CA693C',
big: 'https://uploadfiles.nowcoder.com/images/20211201/920662346_1638327818015/FE8B1A979ADF6E3C2C114AF3F9CA693C',
},
});
</script>
</body>
</html>