懒加载:当访问一个页面的时候,先把img元素或是其他元素的背景图片路径替换成一张大小为1*1px图片的路径(这样就只需请求一次),当图片出现在浏览器的可视区域内时,才设置图片真正的路径,让图片显示出来
1、创建一个自定义属性data-src存放真正需要显示的图片路径,而img自带的src放一张大小为1 * 1px的图片路径。 2、当页面滚动直至此图片出现在可视区域时,用js取到该图片的data-src的值赋给src。
图片懒加载原理
懒加载:当访问一个页面的时候,先把img元素或是其他元素的背景图片路径替换成一张大小为1*1px图片的路径(这样就只需请求一次),当图片出现在浏览器的可视区域内时,才设置图片真正的路径,让图片显示出来
1、创建一个自定义属性data-src存放真正需要显示的图片路径,而img自带的src放一张大小为1 * 1px的图片路径。 2、当页面滚动直至此图片出现在可视区域时,用js取到该图片的data-src的值赋给src。
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