效果图
<!DOCTYPE html>
<html lang="en">
<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>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
#box,
#bigBox {
width: 350px;
height: 350px;
border: 1px solid black;
float: left;
position: relative;
margin: 30px;
overflow: hidden;
}
#bigBox {
display: none;
}
#bigBox img {
position: absolute;
width: 700px;
height: 700px;
left: 0;
top: 0;
}
#mark {
position: absolute;
width: 175px;
height: 175px;
background: rgba(0, 0, 0, 0.3);
cursor: move;
left: 0;
top: 0;
}
</style>
</head>
<body>
<div id="box">
<img src="./img/iphone.jpg" alt="">
</div>
<div id="bigBox">
<img src="./img/iphone_big.jpg" alt="">
</div>
<script>
let bigBox = document.getElementById("bigBox");
let img = bigBox.getElementsByTagName("img")[0];
let box = document.getElementById("box");
let mark;
box.onmouseenter = function () {
mark = document.createElement("mark");
mark.id = "mark";
box.appendChild(mark);
bigBox.style.display = "block"
}
box.onmousemove = function (e) {
let curLeft = e.clientX - box.offsetLeft - mark.offsetWidth / 2;
let curTop = e.clientY - box.offsetTop - mark.offsetHeight / 2;
let MaxL = box.offsetWidth - mark.offsetWidth;
let MinL = 0;
let MinT = 0;
let MaxT = box.offsetHeight - mark.offsetHeight;
if (curLeft < MinL) {
curLeft = MinL;
}
if (curLeft > MaxL) {
curLeft = MaxL;
}
if (curTop < MinT) {
curTop = MinT;
}
if (curTop > MaxT) {
curTop = MaxT;
}
mark.style.left = curLeft + "px";
mark.style.top = curTop + "px";
img.style.left = -2 * curLeft + "px";
img.style.top = -2 * curTop + "px";
}
box.onmouseleave = function () {
box.removeChild(mark)
bigBox.style.display = "none"
}
</script>
</body>
</html>
资源
- iphonejpg
- iphone_big.jpg
