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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学号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.These
2、valuescanbeofmanytypes.Forexample,eveninaverysimplemovieyoumightstillhaveanumber,sometext,andaMovieClipinstance.Allthreeoftheseexamplesaredataofdifferenttypes—whatActionScriptcallsdatatypes.Flashisactuallycapableofperformingdatatypeconversionswhennecessary.However,thiscanlead
3、tosomepoorcodingpracticesonthepartofActionScriptdevelopers.Forthisreason,theActionScript2.0standardsrequirethatyoupaycloserattentiontothedatatypesyouareusing.InActionScript,you’llworkwithmanydifferentdatatypes.However,forthesakeofunderstandinghowthesedatatypeswork,youcanconsi
4、derthemintwobasiccategories:primitivetypesandreferencetypes.Theprimitivetypesarecalledprimitivebecausetheyarethebasicfoundationaldatatypes,notbecausetheylackimportance.Thereferencedatatypesarecalledreferencetypesbecausetheyreferencetheprimitivetypes.Primitivedatatypesincludes
5、trings,numbers,Booleans,undefined,andnull.We’llexamineeachoftheseprimitivedatatypesalittlemorecloselyinthischapter.Referencedatatypesareallobjects,whichisthesubjectofmuchoftherestofthisbook,sowe’lldeferthemajorityofthediscussionofreferencedatatypestothoselaterchapters.Working
6、withStringsStringsarecharactersorwords.Stringvaluesmustalwaysbeenclosedineithersinglequotesordoublequotes.Hereareafewexamplesofstrings:“a”‘b’“1”“Joey”‘123’‘abc’“****”Stringsareusedwheneveryouwanttoworkwithcharactersorwords.Forexample,youcanusestringstopopulatetextfieldsinyour
7、movie,oryoucanusestringstoprogrammaticallycreatenamesfornewMovieClipinstances.You’vealsoalreadyseenhowstringscanbeused14毕业设计（论文）外文资料原文withactionssuchastrace().Thetrace()actionrequiresthatyouprovideitwithamessagetodisplayintheOutputpanel.Thatmessagemustevaluatetoastringvalue.t
8、race(“Iknowhim;Marley’sGhost!”);Asalreadymentioned,youcanuseeitherdo
