<!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>图片滚动懒加载</title>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.js"></script>
</head>
<style>
body {
padding: 20px;
width: 100%;
text-align: center;
background-color: #f3f3f3;
box-sizing: border-box;
}
#box {
width: 50%;
height: 500px;
margin: auto;
}
#box img {
width: 100%;
height: 500px;
transition: 1s;
opacity: 0;
}
</style>
<body>
<div id="box"></div>
</body>
<script>
var data = [
"https://img-blog.csdnimg.cn/f64f5956578e484c8e966d9f85991fd3.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5LqU6Iqx5ryP,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center",
"https://img-blog.csdnimg.cn/534762daa9654b61a89b341a7a82e123.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5LqU6Iqx5ryP,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center",
"https://img-blog.csdnimg.cn/9d70c3fc65fe4e9c84e8c83771826df7.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5LqU6Iqx5ryP,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center",
"https://img-blog.csdnimg.cn/b328014ddb92402396878c8c8a29bd76.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5LqU6Iqx5ryP,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center",
"https://img-blog.csdnimg.cn/a9ed8c40012a4a3ca09c1fe3dba466f8.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5LqU6Iqx5ryP,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center",
"https://img-blog.csdnimg.cn/fd39816f0d904ed590b3258151580fcc.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5LqU6Iqx5ryP,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center",
"https://img-blog.csdnimg.cn/2a44c51419064e26b017f43b2d9425df.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5LqU6Iqx5ryP,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center",
"https://img-blog.csdnimg.cn/93e8ab2461dc414fbd9c99abb41319db.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5LqU6Iqx5ryP,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center",
"https://img-blog.csdnimg.cn/051b1f4c49f343f78de32fb65d1d1882.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5LqU6Iqx5ryP,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center",
"https://img-blog.csdnimg.cn/334ea971d6a04aa0b3bb25d419bec2ac.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5LqU6Iqx5ryP,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center",
"https://img-blog.csdnimg.cn/7ce82c0979304c62a29e01c32b8c2d34.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5LqU6Iqx5ryP,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center",
"https://img-blog.csdnimg.cn/d6dda9d875734104895a6005027a8b42.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5LqU6Iqx5ryP,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center",
"https://img-blog.csdnimg.cn/172ca78bfda447bc95e7e29c9be6d9ee.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5LqU6Iqx5ryP,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center",
]
var box = document.getElementById('box');
for (var i = 0; i < data.length; i++) {
var img = document.createElement('img');
img.dataset.src = data[i];
box.appendChild(img);
}
var imgList = document.querySelectorAll('img');
window.addEventListener('scroll', loadFn);
window.addEventListener('load', loadFn);
function loadFn() {
let loadedImgList = []
for (var i = 0; i < imgList.length; i++) {
if (imgList[i].getBoundingClientRect().top < window.innerHeight) {
if (imgList[i].dataset.src) {
imgList[i].src = imgList[i].dataset.src;
imgList[i].style.opacity = 1;
imgList[i].removeAttribute('data-src');
loadedImgList.push(i)
}
}
}
imgList = imgList.filter((img, index) => !loadedImgList.includes(index))
if (imgList.length == 0) {
window.removeEventListener('scroll', loadFn);
}
}
</script>
</html>
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