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intersection-observer.html
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<!DOCTYPE html>
<html>
<head>
<title></title>
<style type="text/css">
body {
height: 200vh;
}
.test {
width: 654px;
height: 436px;
display: block;
margin: 30px auto;
opacity: 0;
transition: opacity 300ms linear;
}
</style>
</head>
<body>
<img src="" class="test" data-src="https://pic4.zhimg.com/80/v2-e34f9372a05a00a6f5778f6357ec2b0d_720w.jpg?source=1940ef5c" />
<img src="" class="test" data-src="https://pic4.zhimg.com/80/v2-8edde88d4f64057c7e99847164445555_720w.jpg?source=1940ef5c" />
<img src="" class="test" data-src="https://pic1.zhimg.com/80/v2-53414f0e6f72b4706420974b075239e4_720w.jpg?source=1940ef5c" />
<img src="" class="test" data-src="https://pic4.zhimg.com/80/v2-0687ae60cc782edf3d4d1d3ea53df40c_720w.jpg?source=1940ef5c" />
<img src="" class="test" data-src="https://pic4.zhimg.com/80/v2-cb0e4f8cfc2ba10cdb1ae881b005d1c7_720w.jpg?source=1940ef5c" />
<img src="" class="test" data-src="https://pic1.zhimg.com/80/v2-d86e77ad8da6232051ff604d68280160_720w.jpg?source=1940ef5c" />
<img src="" class="test" data-src="https://pic1.zhimg.com/80/v2-879a65e8dba00653cd9ea1b50620267d_720w.jpg?source=1940ef5c" />
<img src="" class="test" data-src="https://pic4.zhimg.com/80/v2-5acc946f33c3a17b2d67e6afc7ea1397_720w.jpg?source=1940ef5c" />
<img src="" class="test" data-src="https://pic4.zhimg.com/80/v2-712509a5174e91a8ae5cf91c6d778650_720w.jpg?source=1940ef5c" />
<img src="" class="test" data-src="https://pic2.zhimg.com/80/v2-1391294d761b2c604d4a131662196703_720w.jpg?source=1940ef5c" />
<script type="text/javascript">
var test = document.getElementsByClassName('test');
var observer = new IntersectionObserver(function (entries) {
// if (entries[0].intersectionRatio <= 0) return;
entries.forEach(function(item) {
// console.log(item)
if(item.isIntersecting) {
item.target.src = item.target.dataset.src;
item.target.style.opacity = 1;
observer.unobserve(item.target);
}
});
});
for(let item of test) {
observer.observe(item);
};
</script>
</body>
</html>