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1、毕业设计（论文）外文资料原文及译文专业计算机科学与技术班级08104121学号0810411504姓名高芸芸指导教师吴敏毕业设计（论文）外文资料原文原文出处：Flash8ActionScriptBible,JoeyLottandRobertReinhardt,PublishedbyWileyPublishing,Inc.Flash8ActionScriptBibleJoeyLottandRobertReinhardtUnderstandingDatatypesWhenwetalkaboutdata,we’retalkingaboutinformationorvalues.Thesevalues
2、canbeofmanytypes.Forexample,eveninaverysimplemovieyoumightstillhaveanumber,sometext,andaMovieClipinstance.Allthreeoftheseexamplesaredataofdifferenttypes—whatActionScriptcallsdatatypes.Flashisactuallycapableofperformingdatatypeconversionswhennecessary.However,thiscanleadtosomepoorcodingpracticesonthe
3、partofActionScriptdevelopers.Forthisreason,theActionScript2.0standardsrequirethatyoupaycloserattentiontothedatatypesyouareusing.InActionScript,you’llworkwithmanydifferentdatatypes.However,forthesakeofunderstandinghowthesedatatypeswork,youcanconsiderthemintwobasiccategories:primitivetypesandreference
4、types.Theprimitivetypesarecalledprimitivebecausetheyarethebasicfoundationaldatatypes,notbecausetheylackimportance.Thereferencedatatypesarecalledreferencetypesbecausetheyreferencetheprimitivetypes.Primitivedatatypesincludestrings,numbers,Booleans,undefined,andnull.We’llexamineeachoftheseprimitivedata
5、typesalittlemorecloselyinthischapter.Referencedatatypesareallobjects,whichisthesubjectofmuchoftherestofthisbook,sowe’lldeferthemajorityofthediscussionofreferencedatatypestothoselaterchapters.WorkingwithStringsStringsarecharactersorwords.Stringvaluesmustalwaysbeenclosedineithersinglequotesordoublequo
6、tes.Hereareafewexamplesofstrings:“a”‘b’“1”“Joey”‘123’‘abc’“****”Stringsareusedwheneveryouwanttoworkwithcharactersorwords.Forexample,youcanusestringstopopulatetextfieldsinyourmovie,oryoucanusestringstoprogrammaticallycreatenamesfornewMovieClipinstances.You’vealsoalreadyseenhowstringscanbeused14毕业设计（论
7、文）外文资料原文withactionssuchastrace().Thetrace()actionrequiresthatyouprovideitwithamessagetodisplayintheOutputpanel.Thatmessagemustevaluatetoastringvalue.trace(“Iknowhim;Marley’sGhost!”);Asalreadymentioned
