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效果：
图片：55.png 
代码： <!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>Document</title>
<style type="text/css">
*{
margin: 0;
padding: 0;
}
ul li{
list-style-type: none;
}
ul li img{
height: 300px;
width: 300px;
}
ul li{
float:left;
margin: 20px;
border: 1px solid red;
}
ul{
overflow: hidden;
}
</style>
</head>
<body>
<div id="list">
<ul>
<li><img data-src ="image/1.jpg" alt=""></li>
<li><img data-src ="image/2.jpg" alt=""></li>
<li><img data-src ="image/3.jpg" alt=""></li>
<li><img data-src ="image/4.jpg" alt=""></li>
<li><img data-src ="image/5.jpg" alt=""></li>
<li><img data-src ="image/6.jpg" alt=""></li>
<li><img data-src ="image/7.jpg" alt=""></li>
<li><img data-src ="image/8.jpg" alt=""></li>
<li><img data-src ="image/9.jpg" alt=""></li>
<li><img data-src ="image/10.jpg" alt=""></li>
</ul>
</div>
<script type="text/javascript">
var imgArr = document.querySelectorAll("#list ul li img");
window.onload = loadImage;
window.onresize = loadImage;
// data- 开头的自定义属性是H5的技术
document.onscroll = loadImage;
function loadImage(){
console.log("12");
var clientHeight =document.documentElement.clientHeight; //显示区域的高度
var scrollTop = document.documentElement.scrollTop; //获取滚动条的top值
for(var i=0;i<imgArr.length;i++){
if(imgArr<i>.src){
continue;
}
// 获取图片到顶站距离
var imgTop = imgArr<i>.offsetTop;
if(imgTop < scrollTop + clientHeight){ //需要显示图片
var src = imgArr<i>.getAttribute("data-src");
imgArr<i>.setAttribute("src",src);
}
}
}
</script>
</body>
</html></i></i></i></i>
视频地址： https://www.bilibili.com/video/BV1p44y1g7b1/ |
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