内置包允许用户通过 Package Manager 启用或禁用 Unity 功能。启用或禁用某个包会减小运行时构建大小。例如，大多数项目不使用旧版粒子系统。
删除此功能的内置包时，Unity 不会在您构建最终应用程序时包含相关的代码和资源。通常，这些内置包中仅包含包清单，并与 Unity 捆绑在一起（而不是在包注册表中提供）。
请单击以下任何链接以查看该内置包的相关文档：
[com.unity.2d.sprite]：http://docs.unity3d.com/Packages/com.unity.2d.sprite@1.0/manual/index.html target=“blank“ [com.unity.2d.tilemap]：http://docs.unity3d.com/Packages/com.unity.2d.tilemap@1.0/manual/index.html target=”blank” [com.unity.modules.ai]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.AIModule.html target=“blank“ [com.unity.modules.androidjni]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.AndroidJNIModule.html target=”blank” [com.unity.modules.animation]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.AnimationModule.html target=“blank“ [com.unity.modules.assetbundle]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.AssetBundleModule.html target=”blank” [com.unity.modules.audio]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.AudioModule.html target=“blank“ [com.unity.modules.cloth]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.ClothModule.html target=”blank” [com.unity.modules.director]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.DirectorModule.html target=“blank“ [com.unity.modules.imageconversion]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.ImageConversionModule.html target=”blank” [com.unity.modules.imgui]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.IMGUIModule.html target=“blank“ [com.unity.modules.jsonserialize]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.JSONSerializeModule.html target=”blank” [com.unity.modules.particlesystem]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.ParticleSystemModule.html target=“blank“ [com.unity.modules.physics]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.PhysicsModule.html target=”blank” [com.unity.modules.physics2d]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.Physics2DModule.html target=“blank“ [com.unity.modules.screencapture]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.ScreenCaptureModule.html target=”blank” [com.unity.modules.subsystems]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.SubsystemsModule.html target=“blank“ [com.unity.modules.terrain]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.TerrainModule.html target=”blank” [com.unity.modules.terrainphysics]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.TerrainPhysicsModule.html target=“blank“ [com.unity.modules.tilemap]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.TilemapModule.html target=”blank” [com.unity.modules.ui]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.UIModule.html target=“blank“ [com.unity.modules.uielements]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.UIElementsModule.html target=”blank” [com.unity.modules.umbra]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.UmbraModule.html target=“blank“ [com.unity.modules.unityanalytics]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.UnityAnalyticsModule.html target=”blank” [com.unity.ugui]：http://docs.unity3d.com/Packages/com.unity.ugui@1.0/manual/index.html target=“blank“ [com.unity.modules.unitywebrequest]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.UnityWebRequestModule.html target=”blank” [com.unity.modules.unitywebrequestassetbundle]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.UnityWebRequestAssetBundleModule.html target=“blank“ [com.unity.modules.unitywebrequestaudio]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.UnityWebRequestAudioModule.html target=”blank” [com.unity.modules.unitywebrequesttexture]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.UnityWebRequestTextureModule.html target=“blank“ [com.unity.modules.unitywebrequestwww]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.UnityWebRequestWWWModule.html target=”blank” [com.unity.modules.vehicles]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.VehiclesModule.html target=“blank“ [com.unity.modules.video]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.VideoModule.html target=”blank” [com.unity.modules.vr]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.VRModule.html target=“blank“ [com.unity.modules.wind]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.WindModule.html target=”blank” [com.unity.modules.xr]：http://docs.unity3d.com/2019.4/Documentation/ScriptReference/UnityEngine.XRModule.html target=“_blank”