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1、JavaScriptPatternsJavaScriptPatternsStoyanStefanovBeijing•Cambridge•Farnham•Köln•Sebastopol•TokyoJavaScriptPatternsbyStoyanStefanovCopyright©2010Yahoo!,Inc..Allrightsreserved.PrintedintheUnitedStatesofAmerica.PublishedbyO’ReillyMedia,Inc.,1005GravensteinHighwayNorth
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3、illy.com.Editor:MaryTreselerIndexer:PotomacIndexing,LLCProductionEditor:TeresaElseyCoverDesigner:KarenMontgomeryCopyeditor:ContentWorks,Inc.InteriorDesigner:DavidFutatoProofreader:TeresaElseyIllustrator:RobertRomanoPrintingHistory:September2010:FirstEdition.Nutshell
4、Handbook,theNutshellHandbooklogo,andtheO’ReillylogoareregisteredtrademarksofO’ReillyMedia,Inc.JavaScriptPatterns,theimageofaEuropeanpartridge,andrelatedtradedressaretrademarksofO’ReillyMedia,Inc.Manyofthedesignationsusedbymanufacturersandsellerstodistinguishtheirpro
5、ductsareclaimedastrademarks.Wherethosedesignationsappearinthisbook,andO’ReillyMedia,Inc.,wasawareofatrademarkclaim,thedesignationshavebeenprintedincapsorinitialcaps.Whileeveryprecautionhasbeentakeninthepreparationofthisbook,thepublisherandauthorassumenoresponsibilit
6、yforerrorsoromissions,orfordamagesresultingfromtheuseoftheinformationcon-tainedherein.ISBN:978-0-596-80675-0[SB]1284038177Tomygirls:Eva,Zlatina,andNathalieTableofContentsPreface....................................................................xiii1.Introduction...
7、........................................................1Patterns1JavaScript:Concepts3Object-Oriented3NoClasses4Prototypes4Environment5ECMAScript55JSLint6TheConsole62.Essentials..............................................................9WritingMaintainableCode9Mi
8、nimizingGlobals10TheProblemwithGlobals11SideEffectsWhenForgettingvar12AccesstotheGlobalObject13SinglevarPattern13Hoisting:AProblemwithScat
