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1、D科技译文ActionScript3:overviewActionScript3.0isapowerfulobject-orientedprogramminglanguagethatsignifiesanimportantevolutionofthecapabilitiesoftheFlashPlayerruntime.ThemotivationdrivingActionScript3.0istocreatealanguageideallysuitedforrapidlybuildingrichInternetapplications,whichhavebecome
2、anessentialpartofthewebexperience.EarlierversionsofActionScriptofferedthepowerandflexibilityrequiredforcreatingtrulyengagingonlineexperiences.ActionScript3.0nowfurtheradvancesthelanguage,providingsuperbperformanceandeaseofdevelopmenttofacilitatehighlycomplexapplications,largedatasetsan
3、dobject-oriented,reusablecodebases.WithActionScript3.0,developerscanachieveexcellentproductivityandperformancewiththecontentandapplicationsthattargetFlashPlayer.ActionScript3.0isbasedonECMAScript,theinternationalstandardizedprogramminglanguageforscripting.ActionScript3.0iscompliantwith
4、theECMAScriptlanguagespecification.ActionScriptisexecutedbytheActionScriptVirtualMachine(AVM)builtintotheFlashPlayer.AVM1,thevirtualmachineusedtoexecutelegacyActionScriptcode,powersFlashPlayertodayandmakespossibleawiderangeofinteractivemediaandrichInternetapplications.However,developer
5、shavestartedtopushAVM1toitslimits–theirprojectrequirementsnowdemandamajorbreakthrough.ActionScript3.0introducesanewhighly-optimizedActionScriptVirtualMachine,AVM2,whichdramaticallyexceedstheperformancepossiblewithAVM1.Asaresult,ActionScript3.0codeexecutesupto10XfasterthanlegacyActionSc
6、riptcode.ThenewAVM2virtualmachineisavailableinFlashPlayer9,andwillbetheprimaryvirtualmachineforActionScriptexecutiongoingforwards.The13olderAVM1willcontinuetobesupportedbyFlashPlayerforbackwardscompatibilitywithexistingandlegacycontent.Therearenumerousproductsthatgeneratecontentandappl
7、icationstargetedattheFlashPlayerruntime,andoftentheseproductsincorporatesupportforActionScripttoaddinteractivityandbehaviortotheiroutput.IntheAdobeproductfamily,professionaldesignersanddevelopersmightuseActionScriptwithinseveraltoolsandservers,suchasFlash®,Flex™,andFlashMediaServerto
