很像知道这种平缓出现图片的效果是如何做的
很像知道这种平缓出现图片的效果是怎么做的
http://down.chinaz.com/class/55_1.htm
上面的网站中 图片只有在出现的时候才加载 显示出来的效果是平滑过渡
怎么实现？
另外从效率方面 直接显示效率高 还是这种方式效率高
------解决方案--------------------
这个是 图片延时加载的效果，避免页面初始加载时过多的http连接请求而导致页面加载缓慢。
楼主搜下 lazyload
------解决方案--------------------
就这个网站来说，默认img标签都是grep.jpg这个图片，一个灰色底片，由于一开始进入页面都是这一个URL，所以下载一次缓存了就省流量了。
其他的都是scroll事件滚动触发的，作者把标签里加了个original属性记录真实的图片URL，当图片滚到视野中就把original设置给src，于是开始下载图片了。
楼主可以把代码直接拿走看看，都是jq写的，网上js代码很多，不复杂。 它只是每次滚动遍历某个class的标签，看看它们是否在屏幕内罢了，在就换一下src。
http://down.chinaz.com/js/imgload.js 这个网站的lazyload JS
------解决方案--------------------
很炫的效果，但是，似乎我不知道该如何具体地应用，JS下载下来了，多的可怕！唉。。。希望楼上详细说下
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