演示：
源码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>随鼠标显示大图</title>
<style>
.picture-list img{
width: 320px;
height: 160px;
}
.big-picture img{
width: 640px;
height: 320px;
}
.big-picture{
position: absolute;// 绝对定位
}
</style>
</head>
<body>
<div class="picture-list">
<img src="images/桌面壁纸1.jpg" alt="">
<img src="images/桌面壁纸2.jpg" alt="">
<img src="images/桌面壁纸3.jpg" alt="">
</div>
<div class="big-picture">
</div>
<script>
let imgList = document.querySelectorAll('.picture-list img');
let bigPicture = document.querySelector('.big-picture');
let picList = document.querySelector('.picture-list')
for (let i in imgList){
imgList[i].onmouseenter = function (){
console.log(this.src);
bigPicture.innerHTML = `<img src='${this.src}'>`;
}
imgList[i].onmouseleave = function (){
bigPicture.innerHTML = '';
}
}
picList.onmousemove = function (e){
let x = e.clientX;
let y = e.clientY;
// 加上移动像素使得图片与鼠标不会相互覆盖
bigPicture.style.top = y+5+"px";
bigPicture.style.left =x+5+"px";
}
</script>
</body>
</html>