lazyload.min.js

/*!
 * An jQuery | zepto plugin for lazy loading images.
 * author -> jieyou
 * see https://github.com/jieyou/lazyload
 * use some tuupola's code https://github.com/tuupola/jquery_lazyload (BSD)
 * use component's throttle https://github.com/component/throttle (MIT)
 */
!function(t){"function"==typeof define&&define.amd?define(["jquery"],t):t(window.jQuery||window.Zepto)}(function(t,e){var a,r,n=window,o=t(n),l={threshold:0,failure_limit:0,event:"scroll",effect:"show",effect_params:null,container:n,data_attribute:"original",data_srcset_attribute:"original-srcset",skip_invisible:!0,appear:i,load:i,vertical_only:!1,check_appear_throttle_time:300,url_rewriter_fn:i,no_fake_img_loader:!1,placeholder_data_img:"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC",placeholder_real_img:"http://ditu.baidu.cn/yyfm/lazyload/0.0.1/img/placeholder.png"};function i(){}function c(t,e){return(e._$container==o?("innerHeight"in n?n.innerHeight:o.height())+o.scrollTop():e._$container.offset().top+e._$container.height())<=t.offset().top-e.threshold}function f(t,e){return(e._$container==o?o.scrollTop():e._$container.offset().top)>=t.offset().top+e.threshold+t.height()}function _(e,a){var r=0;e.each(function(l,i){var _=e.eq(l);if(!(_.width()<=0&&_.height()<=0||"none"===_.css("display")))if(a.vertical_only)if(f(_,a));else if(c(_,a)){if(++r>a.failure_limit)return!1}else d();else if(f(_,a)||function(e,a){return(a._$container==o?t.fn.scrollLeft?o.scrollLeft():n.pageXOffset:a._$container.offset().left)>=e.offset().left+a.threshold+e.width()}(_,a));else if(c(_,a)||function(e,a){return(a._$container==o?o.width()+(t.fn.scrollLeft?o.scrollLeft():n.pageXOffset):a._$container.offset().left+a._$container.width())<=e.offset().left-a.threshold}(_,a)){if(++r>a.failure_limit)return!1}else d();function d(){_.trigger("_lazyload_appear"),r=0}})}function d(t){return t.filter(function(e){return!t.eq(e).data("_lazyload_loadStarted")})}r=Object.prototype.toString,a=function(t){return r.call(t).replace("[object ","").replace("]","")},t.fn.hasOwnProperty("lazyload")||(t.fn.lazyload=function(e){var r,c,f,s=this;return t.isPlainObject(e)||(e={}),t.each(l,function(r,i){var c=a(e[r]);-1!=t.inArray(r,["threshold","failure_limit","check_appear_throttle_time"])?"String"==c?e[r]=parseInt(e[r],10):"Number"!=c&&(e[r]=i):"container"==r?(e.hasOwnProperty(r)?e[r]==n||e[r]==document?e._$container=o:e._$container=t(e[r]):e._$container=o,delete e.container):!l.hasOwnProperty(r)||e.hasOwnProperty(r)&&c==a(l[r])||(e[r]=i)}),r="scroll"==e.event,f=0==e.check_appear_throttle_time?_:function(t,e){var a,r,n,o,l=0;return function(){a=this,r=arguments;var t=new Date-l;return o||(t>=e?i():o=setTimeout(i,e-t)),n};function i(){o=0,l=+new Date,n=t.apply(a,r),a=null,r=null}}(_,e.check_appear_throttle_time),c=r||"scrollstart"==e.event||"scrollstop"==e.event,s.each(function(a,r){var n=this,o=s.eq(a),l=o.attr("src"),f=o.attr("data-"+e.data_attribute),_=e.url_rewriter_fn==i?f:e.url_rewriter_fn.call(n,o,f),u=o.attr("data-"+e.data_srcset_attribute),h=o.is("img");if(o.data("_lazyload_loadStarted")||l==_)return o.data("_lazyload_loadStarted",!0),void(s=d(s));o.data("_lazyload_loadStarted",!1),h&&!l&&o.one("error",function(){o.attr("src",e.placeholder_real_img)}).attr("src",e.placeholder_data_img),o.one("_lazyload_appear",function(){var a,r=t.isArray(e.effect_params);function l(){a&&o.hide(),h?(u&&o.attr("srcset",u),_&&o.attr("src",_)):o.css("background-image",'url("'+_+'")'),a&&o[e.effect].apply(o,r?e.effect_params:[]),s=d(s)}o.data("_lazyload_loadStarted")||(a="show"!=e.effect&&t.fn[e.effect]&&(!e.effect_params||r&&0==e.effect_params.length),e.appear!=i&&e.appear.call(n,o,s.length,e),o.data("_lazyload_loadStarted",!0),e.no_fake_img_loader||u?(e.load!=i&&o.one("load",function(){e.load.call(n,o,s.length,e)}),l()):t("<img />").one("load",function(){l(),e.load!=i&&e.load.call(n,o,s.length,e)}).attr("src",_))}),c||o.on(e.event,function(){o.data("_lazyload_loadStarted")||o.trigger("_lazyload_appear")})}),c&&e._$container.on(e.event,function(){f(s,e)}),o.on("resize load",function(){f(s,e)}),t(function(){f(s,e)}),this})});