延迟加载

/*** @namespace DOM Ready* 兼容某些页面头部没有引用jquery* @function* @param {Function} fn* @example* DOMReady(fn)*/
window.DOMReady = function() {var evt = [],isReady = false,guid = 1,randomKey = +new Date();/** @ignore 执行并销毁队列事件 */var fire = function() {if (!evt) return;for (var i = 0, len = evt.length; i < len; i++) {evt[i]();}evt = null;};/** @ignore IE DOMContentloaded */var doScrollCheck = function() {try {document.documentElement.doScroll('left');isReady = true;} catch(e) {setTimeout(doScrollCheck, 1);return;}isReady && fire();}var addEvent=function() {if (window.addEventListener) {return function(el, eventName, fn) {el.addEventListener(eventName, fn, false);};} else {return function(el, eventName, fn) {if (!fn.guid) {fn.guid = randomKey + guid;guid++;}el['e' + fn.guid] = fn;el[fn.guid] = function() {el['e' + fn.guid](window.event);};el.attachEvent('on' + eventName, el[fn.guid]);};}}();document.addEventListener ? addEvent(document, 'DOMContentLoaded', fire) : doScrollCheck();addEvent(window, 'load', fire);return function(fn) {evt ? evt.push(fn) : fn();};
}();