Fix #13315: compare typeof node.method to var instead of literal "undefined" for safer uglification

src/attributes.js

@@ -137,7 +137,7 @@ jQuery.fn.extend({
 				}
 
 			// Toggle whole class name
-			} else if ( type === "undefined" || type === "boolean" ) {
+			} else if ( type === core_strundefined || type === "boolean" ) {
 				if ( this.className ) {
 					// store className if set
 					jQuery._data( this, "__className__", this.className );
@@ -299,7 +299,7 @@ jQuery.extend({
 		}
 
 		// Fallback to prop when attributes are not supported
-		if ( typeof elem.getAttribute === "undefined" ) {
+		if ( typeof elem.getAttribute === core_strundefined ) {
 			return jQuery.prop( elem, name, value );
 		}
 
@@ -332,7 +332,7 @@ jQuery.extend({
 
 			// In IE9+, Flash objects don't have .getAttribute (#12945)
 			// Support: IE9+
-			if ( typeof elem.getAttribute !== "undefined" ) {
+			if ( typeof elem.getAttribute !== core_strundefined ) {
 				ret =  elem.getAttribute( name );
 			}
 

src/core.js

@@ -5,6 +5,10 @@ var
 	// The deferred used on DOM ready
 	readyList,
 
+	// Support: IE<9
+	// For `typeof node.method` instead of `node.method !== undefined`
+	core_strundefined = typeof undefined,
+
 	// Use the correct document accordingly with window argument (sandbox)
 	document = window.document,
 	location = window.location,

src/event.js

@@ -52,7 +52,7 @@ jQuery.event = {
 			eventHandle = elemData.handle = function( e ) {
 				// Discard the second event of a jQuery.event.trigger() and
 				// when an event is called after a page has unloaded
-				return typeof jQuery !== "undefined" && (!e || jQuery.event.triggered !== e.type) ?
+				return typeof jQuery !== core_strundefined && (!e || jQuery.event.triggered !== e.type) ?
 					jQuery.event.dispatch.apply( eventHandle.elem, arguments ) :
 					undefined;
 			};
@@ -619,7 +619,7 @@ jQuery.removeEvent = document.removeEventListener ?
 
 			// #8545, #7054, preventing memory leaks for custom events in IE6-8
 			// detachEvent needed property on element, by name of that event, to properly expose it to GC
-			if ( typeof elem[ name ] === "undefined" ) {
+			if ( typeof elem[ name ] === core_strundefined ) {
 				elem[ name ] = null;
 			}
 

src/manipulation.js

@@ -531,8 +531,8 @@ jQuery.each({
 function getAll( context, tag ) {
 	var elems, elem,
 		i = 0,
-		found = typeof context.getElementsByTagName !== "undefined" ? context.getElementsByTagName( tag || "*" ) :
-			typeof context.querySelectorAll !== "undefined" ? context.querySelectorAll( tag || "*" ) :
+		found = typeof context.getElementsByTagName !== core_strundefined ? context.getElementsByTagName( tag || "*" ) :
+			typeof context.querySelectorAll !== core_strundefined ? context.querySelectorAll( tag || "*" ) :
 			undefined;
 
 	if ( !found ) {
@@ -778,7 +778,7 @@ jQuery.extend({
 						if ( deleteExpando ) {
 							delete elem[ internalKey ];
 
-						} else if ( typeof elem.removeAttribute !== "undefined" ) {
+						} else if ( typeof elem.removeAttribute !== core_strundefined ) {
 							elem.removeAttribute( internalKey );
 
 						} else {

src/offset.js

@@ -25,7 +25,7 @@ jQuery.fn.offset = function( options ) {
 
 	// If we don't have gBCR, just use 0,0 rather than error
 	// BlackBerry 5, iOS 3 (original iPhone)
-	if ( typeof elem.getBoundingClientRect !== "undefined" ) {
+	if ( typeof elem.getBoundingClientRect !== core_strundefined ) {
 		box = elem.getBoundingClientRect();
 	}
 	win = getWindow( doc );

src/support.js

@@ -201,7 +201,7 @@ jQuery.support = (function() {
 				!parseFloat( ( window.getComputedStyle( marginDiv, null ) || {} ).marginRight );
 		}
 
-		if ( typeof div.style.zoom !== "undefined" ) {
+		if ( typeof div.style.zoom !== core_strundefined ) {
 			// Support: IE<8
 			// Check if natively block-level elements act like inline-block
 			// elements when setting their display to 'inline' and giving