You.Dont.Know.JS.Scope&Closures(上)

You.Dont.Know.JS.Scope&Closures(上)

ID:33759974

大小:6.05 MB

页数:98页

时间:2019-03-01

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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

4、atalog/errata.csp?isbn=9781449335588forreleasedetails.NutshellHandbook,theNutshellHandbooklogo,andtheO’ReillylogoareregisteredtrademarksofO’ReillyMedia,Inc.YouDon’tKnowJavaScript:ScopeandClosures,andrelatedtradedressaretrademarksofO’ReillyMedia,Inc.Man

5、yofthedesignationsusedbymanufacturersandsellerstodistinguishtheirprod‐uctsareclaimedastrademarks.Wherethosedesignationsappearinthisbook,andO’ReillyMedia,Inc.wasawareofatrademarkclaim,thedesignationshavebeenprintedincapsorinitialcaps.Whileeveryprecautio

6、nhasbeentakeninthepreparationofthisbook,thepublisherandauthorassumenoresponsibilityforerrorsoromissions,orfordamagesresultingfromtheuseoftheinformationcontainedherein.ISBN:978-1-449-33558-8[LSI]TableofContentsForeword...................................

7、...................vPreface.......................................................vii1.WhatIsScope?..............................................1CompilerTheory1UnderstandingScope3NestedScope8Errors10Review112.LexicalScope..............................

8、................13Lex-time13CheatingLexical16Review213.FunctionVersusBlockScope.................................23ScopeFromFunctions23HidinginPlainScope24FunctionsasScopes28BlocksasScopes33Review394.Hoisting.............................

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