如下所示:
/**
* picLazyLoad 图片延时加载,包含背景图片
* $(img).picLazyLoad({...})
* data-original 预加载图片地址
* alon
*/
;(function($){
$.fn.imgLazyLoad = function(settings){
var $this = $(this),
_winScrollTop = 0,
_winHeight = $(window).height();
settings = $.extend({
threshold: 0, //