1# JS API Differences 2 3- [Ability framework](js-apidiff-ability.md) 4- [Account subsystem](js-apidiff-account.md) 5- [Application subsystem](js-apidiff-application.md) 6- [ArkUI development framework](js-apidiff-arkui.md) 7- [Power management subsystem](js-apidiff-battery.md) 8- [Bundle management framework](js-apidiff-bundle.md) 9- [Communication subsystem](js-apidiff-communication.md) 10- [Compiler and runtime subsystem](js-apidiff-compiler-and-runtime.md) 11- [DFX subsystem](js-apidiff-dfx.md) 12- [Distributed data management subsystem](js-apidiff-distributed-data.md) 13- [File management subsystem](js-apidiff-file-management.md) 14- [Misc services subsystem](js-apidiff-misc.md) 15- [Multimedia subsystem](js-apidiff-multimedia.md) 16- [Common event and notification subsystem](js-apidiff-notification.md) 17- [Resource scheduler subsystem](js-apidiff-resource-scheduler.md) 18- [Security subsystem](js-apidiff-security.md) 19- [Pan-sensor subsystem](js-apidiff-sensor.md) 20- [Startup subsystem](js-apidiff-start-up.md) 21- [Telephony subsystem](js-apidiff-telephony.md) 22- [Test subsystem](js-apidiff-unitest.md) 23- [Update subsystem](js-apidiff-update.md) 24- [USB subsystem](js-apidiff-usb.md) 25- [User IAM subsystem](js-apidiff-user-iam.md) 26- [Web subsystem](js-apidiff-web.md) 27- [Window manager subsystem](js-apidiff-window.md)