JS图片懒加载
使用IntersectionObserver来进行图片懒加载（可能有兼容性问题），用isIntersecting属性判断是否加载图片，代码如下：
下面展示一些 内联代码片。
<!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>图片懒加载</title>
<style>
.box {
width: 100%;
height: 100%;
}
.text {
width: 100%;
height: 300px;
background-color: antiquewhite;
}
img {
max-width: 100%;
}
</style>
</head>
<body>
<div class="box">
<div class="text">这是文字</div>
<div class="text">这是文字</div>
<div class="text">这是文字</div>
<img data-src="./images/tbg.jpg" alt="">
<img data-src="./images/1.jfif" alt="">
<img data-src="./images/tbg.jpg" alt="">
</div>
<script>
const images = document.querySelectorAll('img');
const callback = entries => {
entries.forEach(entry => {
if (entry.isIntersecting) {
const image = entry.target;
const data_src = image.getAttribute('data-src');
image.setAttribute('src', data_src);
observer.unobserve(image);
}
});
}
const observer = new IntersectionObserver(callback);
images.forEach(image => {
observer.observe(image);
})
</script>
</body>
</html>