lazyload.js

LazyLoad=function(e){function t(t,n){var s,c=e.createElement(t);for(s in n)n.hasOwnProperty(s)&&c.setAttribute(s,n[s]);return c}function n(e){var t,n,s=i[e];s&&(t=s.callback,n=s.urls,n.shift(),u=0,n.length||(t&&t.call(s.context,s.obj),i[e]=null,f[e].length&&c(e)))}function s(){var t=navigator.userAgent;o={async:e.createElement("script").async===!0},(o.webkit=/AppleWebKit\//.test(t))||(o.ie=/MSIE|Trident/.test(t))||(o.opera=/Opera/.test(t))||(o.gecko=/Gecko\//.test(t))||(o.unknown=!0)}function c(c,u,h,g,d){var y,p,b,k,m,v,j=function(){n(c)},w="css"===c,T=[];if(o||s(),u)if(u="string"==typeof u?[u]:u.concat(),w||o.async||o.gecko||o.opera)f[c].push({urls:u,callback:h,obj:g,context:d});else for(y=0,p=u.length;p>y;++y)f[c].push({urls:[u[y]],callback:y===p-1?h:null,obj:g,context:d});if(!i[c]&&(k=i[c]=f[c].shift())){for(l||(l=e.head||e.getElementsByTagName("head")[0]),m=k.urls.concat(),y=0,p=m.length;p>y;++y)v=m[y],w?b=o.gecko?t("style"):t("link",{href:v,rel:"stylesheet"}):(b=t("script",{src:v}),b.async=!1),b.className="lazyload",b.setAttribute("charset","utf-8"),o.ie&&!w&&"onreadystatechange"in b&&!("draggable"in b)?b.onreadystatechange=function(){/loaded|complete/.test(b.readyState)&&(b.onreadystatechange=null,j())}:w&&(o.gecko||o.webkit)?o.webkit?(k.urls[y]=b.href,r()):(b.innerHTML='@import "'+v+'";',a(b)):b.onload=b.onerror=j,T.push(b);for(y=0,p=T.length;p>y;++y)l.appendChild(T[y])}}function a(e){var t;try{t=!!e.sheet.cssRules}catch(s){return u+=1,void(200>u?setTimeout(function(){a(e)},50):t&&n("css"))}n("css")}function r(){var e,t=i.css;if(t){for(e=h.length;--e>=0;)if(h[e].href===t.urls[0]){n("css");break}u+=1,t&&(200>u?setTimeout(r,50):n("css"))}}var o,l,i={},u=0,f={css:[],js:[]},h=e.styleSheets;return{css:function(e,t,n,s){c("css",e,t,n,s)},js:function(e,t,n,s){c("js",e,t,n,s)}}}(this.document);