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图片懒加载的前世今生
source link: https://juejin.im/post/5c9376506fb9a070fc623b2c
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一、前言 通常情况下，HTML 中的图片资源会自上而下依次加载，而部分图片只有在用户向下滚动页面的场景下才能被看见，否则这部分图片的流量就白白浪费了。 所以，对于那些含有大量图片资源的网站，会采用“按需加载”的方式，也就是当图片资源出现在视口区域内，才
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