图片延迟加载

lazyload【百度云】 下载地址

jquery【百度云】下载地址

<script src="js/jquery-3.3.1.min.js"></script>
<script src="js/jquery.lazyload.js"></script>

...

<img class="lazy" data-original="https://haishen2.oss-cn-beijing.aliyuncs.com/images/ewm-box2.jpg">

...


<script type="text/javascript" charset="utf-8">
$(function() {
     //载入方式：fadeIn,离屏幕下方还有580px时就预加载
　　$("img.lazy").lazyload({effect: "fadeIn",threshold :580});
});
</script>