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1、D科技译文ActionScript3overviewActionScript3.0isapowerfulobject-orientedprogramminglanguagethatsignifiesanimportantevolutionofthecapabilitiesoftheFlashPlayerruntime.ThemotivationdrivingActionScript3.0istocreatealanguageideallysuitedforrapidlybuildingrichIntern
2、etapplications,whichhavebecomeanessentialpartofthewebexperience.EarlierversionsofActionScriptofferedthepowerandflexibilityrequiredforcreatingtrulyengagingonlineexperiences.ActionScript3.0nowfurtheradvancesthelanguage,providingsuperbperformanceandeaseofdev
3、elopmenttofacilitatehighlycomplexapplications,largedatasetsandobject-oriented,reusablecodebases.WithActionScript3.0,developerscanachieveexcellentproductivityandperformancewiththecontentandapplicationsthattargetFlashPlayer.ActionScript3.0isbasedonECMAScrip
4、t,theinternationalstandardizedprogramminglanguageforscripting.ActionScript3.0iscompliantwiththeECMAScriptlanguagespecification.ActionScriptisexecutedbytheActionScriptVirtualMachine(AVM)builtintotheFlashPlayer.AVM1,thevirtualmachineusedtoexecutelegacyActio
5、nScriptcode,powersFlashPlayertodayandmakespossibleawiderangeofinteractivemediaandrichInternetapplications.However,developershavestartedtopushAVM1toitslimits一theirprojectrequirementsnowdemandamajorbreakthrough.ActionScript3.0introducesanewhighly-optimizedA
6、ctionScriptVirtualMachine,AVM2,whichdramaticallyexceedstheperformancepossiblewithAVM1.Asaresult,ActionScript3.0codeexecutesupto10XfasterthanlegacyActionScriptcode.ThenewAVM2virtualmachineisavailableinFlashPlayer9,andwillbetheprimaryvirtualmachineforAction
7、Scriptexecutiongoingforwards.TheolderAVM1willcontinuetobesupportedbyFlashPlayerforbackwardscompatibilitywithexistingandlegacycontent.TherearenumerousproductsthatgeneratecontentandapplicationstargetedattheFlashPlayerruntime,andoftentheseproductsincorporate
8、supportforActionScripttoaddinteractivityandbehaviortotheiroutput.IntheAdobeproductfamily,professionaldesignersanddevelopersmightuseActionScriptwithinseveraltoolsandservers,suchasFlash®,Flex™,andFlashMediaServertocre
