1 DOMContentLoaded = function() {  2         if ( document.addEventListener ) {  3             document.removeEventListener( "DOMContentLoaded", DOMContentLoaded, false );  4             jQuery.ready();  5         } else if ( document.readyState === "complete" ) {  6             // we‘re here because readyState === "complete" in oldIE  7             // which is good enough for us to call the dom ready!  8             document.detachEvent( "onreadystatechange", DOMContentLoaded );  9             jQuery.ready(); 10         } 11     }, 12  13  14 ready: function( fn ) { 15         // Add the callback 16         jQuery.ready.promise().done( fn ); 17  18         return this; 19     }, 20  21  22 jQuery.ready.promise = function( obj ) { 23     if ( !readyList ) { 24  25         readyList = jQuery.Deferred(); 26  27         // Catch cases where $(document).ready() is called after the browser event has already occurred. 28         // we once tried to use readyState "interactive" here, but it caused issues like the one 29         // discovered by ChrisS here: http://bugs.jquery.com/ticket/12282#comment:15 30         if ( document.readyState === "complete" ) { 31             // Handle it asynchronously to allow scripts the opportunity to delay ready 32             setTimeout( jQuery.ready, 1 ); 33  34         // Standards-based browsers support DOMContentLoaded 35         } else if ( document.addEventListener ) { 36             // Use the handy event callback 37             document.addEventListener( "DOMContentLoaded", DOMContentLoaded, false ); 38  39             // A fallback to window.onload, that will always work 40             window.addEventListener( "load", jQuery.ready, false ); 41  42         // If IE event model is used 43         } else { 44             // Ensure firing before onl oad, maybe late but safe also for iframes 45             document.attachEvent( "onreadystatechange", DOMContentLoaded ); 46  47             // A fallback to window.onload, that will always work 48             window.attachEvent( "onload", jQuery.ready ); 49  50             // If IE and not a frame 51             // continually check to see if the document is ready 52             var top = false; 53  54             try { 55                 top = window.frameElement == null && document.documentElement; 56             } catch(e) {} 57  58             if ( top && top.doScroll ) { 59                 (function doScrollCheck() { 60                     if ( !jQuery.isReady ) { 61  62                         try { 63                             // Use the trick by Diego Perini 64                             // http://javascript.nwbox.com/IEContentLoaded/ 65                             top.doScroll("left"); 66                         } catch(e) { 67                             return setTimeout( doScrollCheck, 50 ); 68                         } 69  70                         // and execute any waiting functions 71                         jQuery.ready(); 72                     } 73                 })(); 74             } 75         } 76     } 77     return readyList.promise( obj ); 78 }; 79  80  81 ready: function( wait ) { 82  83         // Abort if there are pending holds or we‘re already ready 84         if ( wait === true ? --jQuery.readyWait : jQuery.isReady ) { 85             return; 86         } 87  88         // Make sure body exists, at least, in case IE gets a little overzealous (ticket #5443). 89         if ( !document.body ) { 90             return setTimeout( jQuery.ready, 1 ); 91         } 92  93         // Remember that the DOM is ready 94         jQuery.isReady = true; 95  96         // If a normal DOM Ready event fired, decrement, and wait if need be 97         if ( wait !== true && --jQuery.readyWait > 0 ) { 98             return; 99         }100 101         // If there are functions bound, to execute102         readyList.resolveWith( document, [ jQuery ] );103 104         // Trigger any bound ready events105         if ( jQuery.fn.trigger ) {106             jQuery( document ).trigger("ready").off("ready");107         }108     },