代码拉取完成,页面将自动刷新
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
img {
height: 200px;
display: block;
}
</style>
</head>
<body>
<img src="" data-src="https://www.baidu.com/img/PCtm_d9c8750bed0b3c7d089fa7d55720d6cf.png" alt="">
<img src="" data-src="https://www.baidu.com/img/PCtm_d9c8750bed0b3c7d089fa7d55720d6cf.png" alt="">
<img src="" data-src="https://www.baidu.com/img/PCtm_d9c8750bed0b3c7d089fa7d55720d6cf.png" alt="">
<img src="" data-src="https://www.baidu.com/img/PCtm_d9c8750bed0b3c7d089fa7d55720d6cf.png" alt="">
<img src="" data-src="https://www.baidu.com/img/PCtm_d9c8750bed0b3c7d089fa7d55720d6cf.png" alt="">
<img src="" data-src="https://www.baidu.com/img/PCtm_d9c8750bed0b3c7d089fa7d55720d6cf.png" alt="">
<img src="" data-src="https://www.baidu.com/img/PCtm_d9c8750bed0b3c7d089fa7d55720d6cf.png" alt="">
</body>
<script>
class Lazy {
constructor() {
this.imgList = document.querySelectorAll('img')
this.lazyLoad()
window.addEventListener('scroll', this.throttle(() => {
this.lazyLoad()
}, 200))
}
destroy() {
window.removeEventListener('scroll', this.throttle(() => {
this.lazyLoad()
}, 200))
}
throttle(fn, wait = 1000) {
let timer = null;
return function () {
if (!timer) {
timer = setTimeout(() => {
fn.apply(this, arguments);
timer = null;
}, wait)
}
}
}
lazyLoad() {
const H = document.documentElement.clientHeight;
const S = document.documentElement.scrollTop || document.body.scrollTop;
Array.from(this.imgList).forEach(img => {
if (H + S + 100 > img.offsetTop) {
console.log(4)
img.src = img.dataset.src
}
})
}
}
new Lazy()
</script>
</html>
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