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lazy-load.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<!--360 浏览器在读取到这个标签后，立即切换对应的极速核-->
<meta name="renderer" content="webkit">
<!--优先使用 IE 最新版本和 Chrome-->
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
<!--缩放比例为1-->
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0,user-scalable=no">
<title>图片懒加载</title>
<style>
* {
margin: 0;
padding: 0;
}
.box{
display: -webkit-box; /* 老版本语法: Safari, iOS, Android browser, older WebKit browsers. */
display: -moz-box; /* 老版本语法: Firefox (buggy) */
display: -ms-flexbox; /* 混合版本语法: IE 10 */
display: -webkit-flex; /* 新版本语法: Chrome 21+ */
display: flex; /* 新版本语法: Opera 12.1, Firefox 22+ */
-webkit-align-items: center;
align-items: center;
height: 80px;
padding: 5px 10px;
border-bottom: 1px solid #ccc;
}
.box img{
height:100%;
width: 100px;
margin-right: 10px;
}
.box p{
font-size: 16px;
font-family: "Microsoft Yahei", "微软雅黑";
}
</style>
</head>
<body>
<div class="main">
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img1" data-src="images/img1.png" />
<p>可以下滑查看懒加载效果</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img2" data-src="images/img2.png" />
<p>实现原理其实很简单</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img3" data-src="images/img3.png" />
<p>先让图片引用默认图片</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img4" data-src="images/img4.png" />
<p>把真实图片地址放在data-*属性上面</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img5" data-src="images/img5.png" />
<p>然后监听滚动就可以了</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img6" data-src="images/img6.png" />
<p>可以下滑查看懒加载效果</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img7" data-src="images/img7.png" />
<p>实现原理其实很简单</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img8" data-src="images/img8.png" />
<p>先让图片引用默认图片</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img9" data-src="images/img9.png" />
<p>把真实图片地址放在data-*属性上面</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img10" data-src="images/img10.png" />
<p>然后监听滚动就可以了</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img11" data-src="images/img11.png" />
<p>可以下滑查看懒加载效果</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img12" data-src="images/img12.png" />
<p>实现原理其实很简单</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img13" data-src="images/img13.png" />
<p>先让图片引用默认图片</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img14" data-src="images/img14.png" />
<p>把真实图片地址放在data-*属性上面</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img15" data-src="images/img15.png" />
<p>然后监听滚动就可以了</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img16" data-src="images/img16.png" />
<p>可以下滑查看懒加载效果</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img17" data-src="images/img17.png" />
<p>实现原理其实很简单</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img18" data-src="images/img18.png" />
<p>先让图片引用默认图片</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img19" data-src="images/img19.png" />
<p>把真实图片地址放在data-*属性上面</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img20" data-src="images/img20.png" />
<p>然后监听滚动就可以了</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img21" data-src="images/img21.png" />
<p>可以下滑查看懒加载效果</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img22" data-src="images/img22.png" />
<p>实现原理其实很简单</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img23" data-src="images/img23.png" />
<p>先让图片引用默认图片</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img24" data-src="images/img24.png" />
<p>把真实图片地址放在data-*属性上面</p>
</div>
<div class="box">
<img class="lazyloadimg" src="images/default.png" alt="img25" data-src="images/img25.png" />
<p>然后监听滚动就可以了</p>
</div>
</div>
</body>
<script src="./ready.js"></script>
<script>
document.ready(function () {
window.addEventListener('scroll', function () {
var bodyScrollHeight = document.body.scrollTop;// body滚动高度
var windowHeight = window.innerHeight;// 视窗高度
var imgs = document.getElementsByClassName('lazyloadimg');
for (var i =0; i < imgs.length; i++) {
var imgHeight = imgs[i].offsetTop;// 图片距离顶部高度
if (imgHeight < windowHeight + bodyScrollHeight) {
imgs[i].src = imgs[i].getAttribute('data-src');
imgs[i].className = imgs[i].className.replace('lazyloadimg','')
}
}
})
});
</script>
</html>