This project forked from hexl21/demo-echo
移动端的用户更在意网络流量的节约，如果我们总是无意义的为用户加载用户未看到的图片，会使我们的 App 增加很多无意义的流量浪费。 echo.js 很好的解决了这一问题，只有屏幕当前正在显示的图片才会下载到手机本地，这种方式在表象上看起来也更接近原生体验。
#基于 echo 前端框架实现的图片延时加载
移动端的用户更在意网络流量的节约，如果我们总是无意义的为用户加载用户未看到的图片，会使我们的 App 增加很多无意义的流量浪费。 echo.js 很好的解决了这一问题，只有屏幕当前正在显示的图片才会下载到手机本地，这种方式在表象上看起来也更接近原生体验。
##这个示例以脚本方式为开发者实现
##开发指南
调用示例
echo.init({
offset: 0, // 指定距离视窗上下左右位置图片预加载 Number|String Default: 0
throttle: 250, // 延迟加载 Number|String Default: 250
unload: true,
callback: function(element, op) {
// console.log(element, 'has been', op + 'ed')
}
});
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