<!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>
</style>
</head>
<body>
<p style="height: 500px;background-color:red;"></p>
<p style="height: 500px;background-color:yellow;"></p>
<div>
<img src="" alt="" data-src="img/1.jpg">
</div>
<div>
<img src="" alt="" data-src="img/2.jpg">
</div>
<div>
<img src="" alt="" data-src="img/3.jpg">
</div>
<div>
<img src="" alt="" data-src="img/4.jpg">
</div>
<script>
var imgs = document.getElementsByTagName('img');
window.onscroll = function () {
for (var i = 0; i < imgs.length; i++) {
var offT = imgs[i].offsetTop;
var clientH = document.documentElement.clientHeight;
var lay = document.documentElement.scrollTop || document.body.scrollTop;
if (lay >= offT - clientH) {
imgs[i].src = imgs[i].getAttribute('data-src');
}
}
}
</script>
</body>
</html>
以上是圖片懶加載的代碼，可複製哦