懒加载

var Lazy = function(){
        var load = function(){
            var imgs = $(‘img[data-lazyload]‘),
                winY = WIN.height(),
                scrollY = WIN.scrollTop();

            imgs.each(function(index, img){
                img = $(img);

                var data = img.attr(‘data-lazyload‘),
                    //src = img.attr(‘src‘),
                    imgY = img.offset().top;

                if(/*!src && */data && imgY <= winY + scrollY){
                    img.attr(‘src‘, data).removeAttr(‘data-lazyload‘);
                }
            });
        };

        load();
        WIN.on({
            resize: load,
            scroll: load
        });
    };