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1、ScopeandClosuresKyleSimpsonScopeandClosuresbyKyleSimpsonCopyright©2014GetifySolutions,Inc.Allrightsreserved.PrintedintheUnitedStatesofAmerica.PublishedbyO’ReillyMedia,Inc.,1005GravensteinHighwayNorth,Sebastopol,CA95472.O’Reillybooksmaybepurchasedforedu
2、cational,business,orsalespromotionaluse.Onlineeditionsarealsoavailableformosttitles(http://my.safaribooksonline.com).Formoreinformation,contactourcorporate/institutionalsalesdepartment:800-998-9938orcorporate@oreilly.com.Editors:SimonSt.LaurentandBrian
3、Mac‐CoverDesigner:KarenMontgomeryDonaldInteriorDesigner:DavidFutatoProductionEditor:MelanieYarbroughIllustrator:RebeccaDemarestProofreader:LinleyDolbyMarch2014:FirstEditionRevisionHistoryfortheFirstEdition:2014-03-06:FirstreleaseSeehttp://oreilly.com/c
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6、nhasbeentakeninthepreparationofthisbook,thepublisherandauthorassumenoresponsibilityforerrorsoromissions,orfordamagesresultingfromtheuseoftheinformationcontainedherein.ISBN:978-1-449-33558-8[LSI]TableofContentsForeword...................................
7、...................vPreface.......................................................vii1.WhatIsScope?..............................................1CompilerTheory1UnderstandingScope3NestedScope8Errors10Review112.LexicalScope..............................
8、................13Lex-time13CheatingLexical16Review213.FunctionVersusBlockScope.................................23ScopeFromFunctions23HidinginPlainScope24FunctionsasScopes28BlocksasScopes33Review394.Hoisting.............................
