var turbo = turbo || {};

 var W3C = document.addEventListener ? true : false;

 var doc = document, html = document.documentElement;

 var readyList = [];

 turbo.ready = function(fn) {

     //不管是哪个分支，只要触发过一次ready事件readyList就会为null

     if (readyList) {

         readyList.push(fn);

     } else {

         fn();

     }

 };

 function fireReady() {

     if (readyList && readyList.length) {

         for (var i = 0, len = readyList.length; i < len; i++) {

             var fn = readyList[i];

             fn();

         }

     }

     readyList = null;

 }

 function doScrollCheck() {

     try {

         html.doScroll('left');

         fireReady();

     } catch (e) {

         setTimeout(doScrollCheck, 50);

     }

 }

 var ready = W3C ? "DOMContentLoaded" : "readystatechange";

 //由于firefox3.6不支持readyState，则在不支持readyState的时需手动赋值给它

 if (!doc.readyState) {

     //如果doc.body已存在则说明domcontentloaded了，将doc.readySate设置为complete

     var readyState = doc.readySate = doc.body ? "complete" : "loading";

 }

 if (doc.readyState == 'complete') {

     fireReady();

 } else {

     $.bind(doc, ready, function() {

         if (W3C || doc.readyState == 'complete') {

             fireReady();

             //firefox3.6,我觉得这里设不设置都行，因为这里已经用不到了doc.readyState了

             if (readyState) {

                 doc.readyState = 'complete';

             }

         }

     })

     //ie下使用doScroll，尽量提前触发ready，此方法只在非iframe下的页面有效

     var top = false;

     try {

         top = doc.frameElement == null && doc.documentElement;

     } catch (e) {}

     if (top && top.doScroll) {

         doScrollCheck();

     }

 }