Jquery实现ready()的源码

 function bindReady(){
if ( readyBound ) return;
readyBound = true; // Mozilla, Opera and webkit nightlies currently support this event
if ( document.addEventListener ) {
// Use the handy event callback
document.addEventListener( "DOMContentLoaded", function(){
document.removeEventListener( "DOMContentLoaded", arguments.callee, false );
jQuery.ready();
}, false ); // If IE event model is used
} else if ( document.attachEvent ) {
// ensure firing before onload,
// maybe late but safe also for iframes
document.attachEvent("onreadystatechange", function(){
if ( document.readyState === "complete" ) {
document.detachEvent( "onreadystatechange", arguments.callee );
jQuery.ready();
}
}); // If IE and not an iframe
// continually check to see if the document is ready
if ( document.documentElement.doScroll && typeof window.frameElement === "undefined" )
(function(){
if ( jQuery.isReady ) return; try {
// If IE is used, use the trick by Diego Perini
// http://javascript.nwbox.com/IEContentLoaded/
document.documentElement.doScroll("left");
} catch( error ) {
setTimeout( arguments.callee, 0 );
return;
} // and execute any waiting functions
jQuery.ready();
})();
} // A fallback to window.onload, that will always work
jQuery.event.add( window, "load", jQuery.ready );
}

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

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