[Building.Polyfills(2014.2)].Brandon.Satrom.文字版.pdf

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1、BuildingPolyfillsWebPlatformAPIsforthePresentandFutureBrandonSatromBuildingPolyfillsbyBrandonSatromCopyright©2014BrandonSatrom.Allrightsreserved.PrintedintheUnitedStatesofAmerica.PublishedbyO’ReillyMedia,Inc.,1005GravensteinHighwayNorth,Sebastopol,CA95472.O’Reillybooksmay

2、bepurchasedforeducational,business,orsalespromotionaluse.Onlineeditionsarealsoavailableformosttitles(http://my.safaribooksonline.com).Formoreinformation,contactourcorporate/institutionalsalesdepartment:800-998-9938orcorporate@oreilly.com.Editors:SimonSt.LaurentandBrianAnd

3、ersonCoverDesigner:RandyComerProductionEditor:NicoleShelbyInteriorDesigner:DavidFutatoProofreader:SharonWilkeyIllustrator:RebeccaDemarestFebruary2014:FirstEditionRevisionHistoryfortheFirstEdition:2014-02-14:FirstreleaseSeehttp://oreilly.com/catalog/errata.csp?isbn=9781449

4、370732forreleasedetails.NutshellHandbook,theNutshellHandbooklogo,andtheO’ReillylogoareregisteredtrademarksofO’ReillyMedia,Inc.BuildingPolyfills,theimageofabeechmarten,andrelatedtradedressaretrademarksofO’ReillyMedia,Inc.Manyofthedesignationsusedbymanufacturersandsellersto

5、distinguishtheirproductsareclaimedastrademarks.Wherethosedesignationsappearinthisbook,andO’ReillyMedia,Inc.wasawareofatrademarkclaim,thedesignationshavebeenprintedincapsorinitialcaps.Whileeveryprecautionhasbeentakeninthepreparationofthisbook,thepublisherandauthorassumenor

6、esponsibilityforerrorsoromissions,orfordamagesresultingfromtheuseoftheinformationcontainedherein.ISBN:978-1-449-37073-2[LSI]TableofContentsPreface.......................................................................viiForeword............................................

7、........................xiiiPartI.BuildingPolyfills1.TheCurrentStateofWebPolyfills..............................................3Polyfilling:Past,Present,andFuture3WhatIsaPolyfill(andWhatIsItNot)?4TypesofPolyfills5TheShim5TheOpt-InPolyfill7TheDrop-InPolyfill9TheForwardPol

8、yfill10WhyPolyfillsStillMatter112.PrinciplesandPracticesofPolyfillDevelopment...................