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  • Jquery实现ready()的源码

     1 function bindReady(){     
     2     if ( readyBound ) return;     
     3     readyBound = true;     
     4     
     5     // Mozilla, Opera and webkit nightlies currently support this event     
     6     if ( document.addEventListener ) {     
     7         // Use the handy event callback     
     8         document.addEventListener( "DOMContentLoaded", function(){     
     9             document.removeEventListener( "DOMContentLoaded", arguments.callee, false );     
    10             jQuery.ready();     
    11         }, false );     
    12     
    13     // If IE event model is used     
    14     } else if ( document.attachEvent ) {     
    15         // ensure firing before onload,     
    16         // maybe late but safe also for iframes     
    17         document.attachEvent("onreadystatechange", function(){     
    18             if ( document.readyState === "complete" ) {     
    19                 document.detachEvent( "onreadystatechange", arguments.callee );     
    20                 jQuery.ready();     
    21             }     
    22         });     
    23     
    24         // If IE and not an iframe     
    25         // continually check to see if the document is ready     
    26         if ( document.documentElement.doScroll && typeof window.frameElement === "undefined" ) 
    27           (function(){     
    28             if ( jQuery.isReady ) return;     
    29     
    30             try {     
    31                 // If IE is used, use the trick by Diego Perini     
    32                 // http://javascript.nwbox.com/IEContentLoaded/     
    33                 document.documentElement.doScroll("left");     
    34             } catch( error ) {     
    35                 setTimeout( arguments.callee, 0 );     
    36                 return;     
    37             }     
    38     
    39             // and execute any waiting functions     
    40             jQuery.ready();     
    41         })();     
    42     }     
    43     
    44     // A fallback to window.onload, that will always work     
    45     jQuery.event.add( window, "load", jQuery.ready );     
    46 }   

    关键:IE or Webkit|Moz 内核判断、DOMContentLoaded事件、onreadystatechange事件、readyState==“complete”

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  • 原文地址:https://www.cnblogs.com/hongchenok/p/3919271.html
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