前面的文章中講過(guò)，在游戲啟動(dòng)時(shí)，會(huì)調(diào)用大量的addRegisterCallback函數(shù)，向SpiderMonkey注冊(cè)Cocos2d-x引擎的函數(shù)。

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ScriptingCore* sc = ScriptingCore::getInstance(); sc->addRegisterCallback(register_all_cocos2dx); sc->addRegisterCallback(register_all_cocos2dx_extension); sc->addRegisterCallback(register_cocos2dx_js_extensions); sc->addRegisterCallback(register_all_cocos2dx_extension_manual); sc->addRegisterCallback(jsb_register_chipmunk); sc->addRegisterCallback(JSB_register_opengl); sc->addRegisterCallback(jsb_register_system); sc->addRegisterCallback(MinXmlHttpRequest::_js_register); sc->addRegisterCallback(register_jsb_websocket); sc->addRegisterCallback(register_all_cocos2dx_builder); sc->addRegisterCallback(register_CCBuilderReader); sc->addRegisterCallback(register_all_cocos2dx_gui); sc->addRegisterCallback(register_all_cocos2dx_gui_manual); sc->addRegisterCallback(register_all_cocos2dx_studio); sc->addRegisterCallback(register_all_cocos2dx_studio_manual); sc->addRegisterCallback(register_all_cocos2dx_spine); sc->start();

以register_all_cocos2dx注冊(cè)函數(shù)為例，跳轉(zhuǎn)到實(shí)現(xiàn)代碼：

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void?register_all_cocos2dx(JSContext* cx, JSObject* obj) { ????// first, try to get the ns ????JS::RootedValue nsval(cx); ????JSObject *ns; ????JS_GetProperty(cx, obj,?"cc", &nsval); ????if?(nsval == JSVAL_VOID) { ????????ns = JS_NewObject(cx, NULL, NULL, NULL); ????????nsval = OBJECT_TO_JSVAL(ns); ????????JS_SetProperty(cx, obj,?"cc", nsval); ????}?else?{ ????????JS_ValueToObject(cx, nsval, &ns); ????} ????obj = ns; ????js_register_cocos2dx_Action(cx, obj); ????js_register_cocos2dx_FiniteTimeAction(cx, obj); ????js_register_cocos2dx_ActionInstant(cx, obj); ????js_register_cocos2dx_Hide(cx, obj); ????js_register_cocos2dx_Node(cx, obj); ????js_register_cocos2dx_Scene(cx, obj); ????js_register_cocos2dx_TransitionScene(cx, obj); ????js_register_cocos2dx_TransitionEaseScene(cx, obj); ????js_register_cocos2dx_TransitionMoveInL(cx, obj); ????js_register_cocos2dx_TransitionMoveInB(cx, obj); ????js_register_cocos2dx_Layer(cx, obj); ????js_register_cocos2dx___LayerRGBA(cx, obj); ????js_register_cocos2dx_AtlasNode(cx, obj); ????js_register_cocos2dx_TileMapAtlas(cx, obj); ????js_register_cocos2dx_TransitionMoveInT(cx, obj); ????js_register_cocos2dx_TransitionMoveInR(cx, obj); ????js_register_cocos2dx_ParticleSystem(cx, obj); ????js_register_cocos2dx_ParticleSystemQuad(cx, obj); ????js_register_cocos2dx_ParticleSnow(cx, obj); ????js_register_cocos2dx_ActionInterval(cx, obj); ????js_register_cocos2dx_ActionCamera(cx, obj); ????js_register_cocos2dx_ProgressFromTo(cx, obj); ????js_register_cocos2dx_MoveBy(cx, obj); ????js_register_cocos2dx_MoveTo(cx, obj); ????js_register_cocos2dx_JumpBy(cx, obj); ????js_register_cocos2dx_ActionEase(cx, obj); ????js_register_cocos2dx_EaseBounce(cx, obj); ????js_register_cocos2dx_EaseBounceIn(cx, obj); ????js_register_cocos2dx_TransitionRotoZoom(cx, obj); ????js_register_cocos2dx_Director(cx, obj); ????js_register_cocos2dx_Texture2D(cx, obj); ????js_register_cocos2dx_EaseElastic(cx, obj); ????js_register_cocos2dx_EaseElasticOut(cx, obj); ????js_register_cocos2dx_EaseBackOut(cx, obj); ????js_register_cocos2dx_TransitionSceneOriented(cx, obj); ????js_register_cocos2dx_TransitionFlipX(cx, obj); ????js_register_cocos2dx_Spawn(cx, obj); ????js_register_cocos2dx_SimpleAudioEngine(cx, obj); ????js_register_cocos2dx_SkewTo(cx, obj); ????js_register_cocos2dx_SkewBy(cx, obj); ????js_register_cocos2dx_TransitionProgress(cx, obj); ????js_register_cocos2dx_TransitionProgressVertical(cx, obj); ????js_register_cocos2dx_TMXTiledMap(cx, obj); ????js_register_cocos2dx_GridAction(cx, obj); ????js_register_cocos2dx_Grid3DAction(cx, obj); ????js_register_cocos2dx_FadeIn(cx, obj); ????js_register_cocos2dx_AnimationCache(cx, obj); ????js_register_cocos2dx_FlipX3D(cx, obj); ????js_register_cocos2dx_FlipY3D(cx, obj); ????js_register_cocos2dx_EaseSineInOut(cx, obj); ????js_register_cocos2dx_TransitionFlipAngular(cx, obj); ????js_register_cocos2dx_EGLViewProtocol(cx, obj); ????js_register_cocos2dx_EGLView(cx, obj); ????js_register_cocos2dx_EaseElasticInOut(cx, obj); ????js_register_cocos2dx_Show(cx, obj); ????js_register_cocos2dx_FadeOut(cx, obj); ????js_register_cocos2dx_CallFunc(cx, obj); ????js_register_cocos2dx_Waves3D(cx, obj); ????js_register_cocos2dx_ParticleFireworks(cx, obj); ????js_register_cocos2dx_MenuItem(cx, obj); ????js_register_cocos2dx_MenuItemSprite(cx, obj); ????js_register_cocos2dx_MenuItemImage(cx, obj); ????js_register_cocos2dx_ParticleFire(cx, obj); ????js_register_cocos2dx_TransitionZoomFlipAngular(cx, obj); ????js_register_cocos2dx_EaseRateAction(cx, obj); ????js_register_cocos2dx_EaseIn(cx, obj); ????js_register_cocos2dx_EaseExponentialInOut(cx, obj); ????js_register_cocos2dx_EaseBackInOut(cx, obj); ????js_register_cocos2dx_EaseExponentialOut(cx, obj); ????js_register_cocos2dx_SpriteBatchNode(cx, obj); ????js_register_cocos2dx_Label(cx, obj); ????js_register_cocos2dx_Application(cx, obj); ????js_register_cocos2dx_DelayTime(cx, obj); ????js_register_cocos2dx_LabelAtlas(cx, obj); ????js_register_cocos2dx_LabelBMFont(cx, obj); ????js_register_cocos2dx_TransitionFadeTR(cx, obj); ????js_register_cocos2dx_TransitionFadeBL(cx, obj); ????js_register_cocos2dx_EaseElasticIn(cx, obj); ????js_register_cocos2dx_ParticleSpiral(cx, obj); ????js_register_cocos2dx_TiledGrid3DAction(cx, obj); ????js_register_cocos2dx_FadeOutTRTiles(cx, obj); ????js_register_cocos2dx_FadeOutUpTiles(cx, obj); ????js_register_cocos2dx_FadeOutDownTiles(cx, obj); ????js_register_cocos2dx_TextureCache(cx, obj); ????js_register_cocos2dx_ActionTween(cx, obj); ????js_register_cocos2dx_TransitionFadeDown(cx, obj); ????js_register_cocos2dx_ParticleSun(cx, obj); ????js_register_cocos2dx_TransitionProgressHorizontal(cx, obj); ????js_register_cocos2dx_TMXObjectGroup(cx, obj); ????js_register_cocos2dx_TMXLayer(cx, obj); ????js_register_cocos2dx_FlipX(cx, obj); ????js_register_cocos2dx_FlipY(cx, obj); ????js_register_cocos2dx_TransitionSplitCols(cx, obj); ????js_register_cocos2dx_Timer(cx, obj); ????js_register_cocos2dx_FadeTo(cx, obj); ????js_register_cocos2dx_Repeat(cx, obj); ????js_register_cocos2dx_Place(cx, obj); ????js_register_cocos2dx_GLProgram(cx, obj); ????js_register_cocos2dx_EaseBounceOut(cx, obj); ????js_register_cocos2dx_RenderTexture(cx, obj); ????js_register_cocos2dx_TintBy(cx, obj); ????js_register_cocos2dx_TransitionShrinkGrow(cx, obj); ????js_register_cocos2dx_Sprite(cx, obj); ????js_register_cocos2dx_LabelTTF(cx, obj); ????js_register_cocos2dx_ClippingNode(cx, obj); ????js_register_cocos2dx_ParticleFlower(cx, obj); ????js_register_cocos2dx_ParticleSmoke(cx, obj); ????js_register_cocos2dx_LayerMultiplex(cx, obj); ????js_register_cocos2dx_Blink(cx, obj); ????js_register_cocos2dx_ShaderCache(cx, obj); ????js_register_cocos2dx_JumpTo(cx, obj); ????js_register_cocos2dx_ParticleExplosion(cx, obj); ????js_register_cocos2dx_TransitionJumpZoom(cx, obj); ????js_register_cocos2dx_Touch(cx, obj); ????js_register_cocos2dx_AnimationFrame(cx, obj); ????js_register_cocos2dx_NodeGrid(cx, obj); ????js_register_cocos2dx_TMXLayerInfo(cx, obj); ????js_register_cocos2dx_TMXTilesetInfo(cx, obj); ????js_register_cocos2dx_GridBase(cx, obj); ????js_register_cocos2dx_TiledGrid3D(cx, obj); ????js_register_cocos2dx_ParticleGalaxy(cx, obj); ????js_register_cocos2dx_Twirl(cx, obj); ????js_register_cocos2dx_MenuItemLabel(cx, obj); ????js_register_cocos2dx_LayerColor(cx, obj); ????js_register_cocos2dx_FadeOutBLTiles(cx, obj); ????js_register_cocos2dx_LayerGradient(cx, obj); ????js_register_cocos2dx_TargetedAction(cx, obj); ????js_register_cocos2dx_RepeatForever(cx, obj); ????js_register_cocos2dx_CardinalSplineTo(cx, obj); ????js_register_cocos2dx_CardinalSplineBy(cx, obj); ????js_register_cocos2dx_TransitionFlipY(cx, obj); ????js_register_cocos2dx_TurnOffTiles(cx, obj); ????js_register_cocos2dx_TintTo(cx, obj); ????js_register_cocos2dx_CatmullRomTo(cx, obj); ????js_register_cocos2dx_ToggleVisibility(cx, obj); ????js_register_cocos2dx_DrawNode(cx, obj); ????js_register_cocos2dx_TransitionTurnOffTiles(cx, obj); ????js_register_cocos2dx_RotateTo(cx, obj); ????js_register_cocos2dx_TransitionSplitRows(cx, obj); ????js_register_cocos2dx_TransitionProgressRadialCCW(cx, obj); ????js_register_cocos2dx_ScaleTo(cx, obj); ????js_register_cocos2dx_TransitionPageTurn(cx, obj); ????js_register_cocos2dx_BezierBy(cx, obj); ????js_register_cocos2dx_BezierTo(cx, obj); ????js_register_cocos2dx_Menu(cx, obj); ????js_register_cocos2dx_SpriteFrame(cx, obj); ????js_register_cocos2dx_ActionManager(cx, obj); ????js_register_cocos2dx_TransitionFade(cx, obj); ????js_register_cocos2dx_TransitionZoomFlipX(cx, obj); ????js_register_cocos2dx_SpriteFrameCache(cx, obj); ????js_register_cocos2dx_TransitionCrossFade(cx, obj); ????js_register_cocos2dx_Ripple3D(cx, obj); ????js_register_cocos2dx_TransitionSlideInL(cx, obj); ????js_register_cocos2dx_TransitionSlideInT(cx, obj); ????js_register_cocos2dx_StopGrid(cx, obj); ????js_register_cocos2dx_ShakyTiles3D(cx, obj); ????js_register_cocos2dx_PageTurn3D(cx, obj); ????js_register_cocos2dx_Grid3D(cx, obj); ????js_register_cocos2dx_TransitionProgressInOut(cx, obj); ????js_register_cocos2dx_EaseBackIn(cx, obj); ????js_register_cocos2dx_SplitRows(cx, obj); ????js_register_cocos2dx_Follow(cx, obj); ????js_register_cocos2dx_Animate(cx, obj); ????js_register_cocos2dx_ShuffleTiles(cx, obj); ????js_register_cocos2dx_ProgressTimer(cx, obj); ????js_register_cocos2dx_ParticleMeteor(cx, obj); ????js_register_cocos2dx_EaseInOut(cx, obj); ????js_register_cocos2dx_TransitionZoomFlipY(cx, obj); ????js_register_cocos2dx_ScaleBy(cx, obj); ????js_register_cocos2dx_Lens3D(cx, obj); ????js_register_cocos2dx_Animation(cx, obj); ????js_register_cocos2dx_TMXMapInfo(cx, obj); ????js_register_cocos2dx_EaseExponentialIn(cx, obj); ????js_register_cocos2dx_ReuseGrid(cx, obj); ????js_register_cocos2dx_MenuItemAtlasFont(cx, obj); ????js_register_cocos2dx_Liquid(cx, obj); ????js_register_cocos2dx_OrbitCamera(cx, obj); ????js_register_cocos2dx_ParticleBatchNode(cx, obj); ????js_register_cocos2dx_Component(cx, obj); ????js_register_cocos2dx_TextFieldTTF(cx, obj); ????js_register_cocos2dx_ParticleRain(cx, obj); ????js_register_cocos2dx_Waves(cx, obj); ????js_register_cocos2dx_EaseOut(cx, obj); ????js_register_cocos2dx_MenuItemFont(cx, obj); ????js_register_cocos2dx_TransitionFadeUp(cx, obj); ????js_register_cocos2dx_EaseSineOut(cx, obj); ????js_register_cocos2dx_JumpTiles3D(cx, obj); ????js_register_cocos2dx_MenuItemToggle(cx, obj); ????js_register_cocos2dx_RemoveSelf(cx, obj); ????js_register_cocos2dx_SplitCols(cx, obj); ????js_register_cocos2dx_MotionStreak(cx, obj); ????js_register_cocos2dx_RotateBy(cx, obj); ????js_register_cocos2dx_FileUtils(cx, obj); ????js_register_cocos2dx_ProgressTo(cx, obj); ????js_register_cocos2dx_TransitionProgressOutIn(cx, obj); ????js_register_cocos2dx_CatmullRomBy(cx, obj); ????js_register_cocos2dx_Sequence(cx, obj); ????js_register_cocos2dx_Shaky3D(cx, obj); ????js_register_cocos2dx_TransitionProgressRadialCW(cx, obj); ????js_register_cocos2dx_EaseBounceInOut(cx, obj); ????js_register_cocos2dx_TransitionSlideInR(cx, obj); ????js_register_cocos2dx___NodeRGBA(cx, obj); ????js_register_cocos2dx_ParallaxNode(cx, obj); ????js_register_cocos2dx_Scheduler(cx, obj); ????js_register_cocos2dx_EaseSineIn(cx, obj); ????js_register_cocos2dx_WavesTiles3D(cx, obj); ????js_register_cocos2dx_TransitionSlideInB(cx, obj); ????js_register_cocos2dx_Speed(cx, obj); ????js_register_cocos2dx_ShatteredTiles3D(cx, obj); }

首先看到的是從根對(duì)象中獲取一個(gè)“cc”屬性（如果獲取不到，就新建一個(gè)），因?yàn)镴S中沒(méi)有名字空間的概念，所以我們使用一個(gè)cc對(duì)象來(lái)表示類似的功能。所有的類型和函數(shù)都是這個(gè)cc對(duì)象下面的屬性。在Cocos2d-x 3.0中，C++層面，類名去掉了CC的前綴，和js保持一致。

然后就是一大堆子函數(shù)，每個(gè)函數(shù)都負(fù)責(zé)注冊(cè)一個(gè)對(duì)應(yīng)的類。打開(kāi)js_register_cocos2dx_Sprite，這個(gè)函數(shù)負(fù)責(zé)注冊(cè)Sprite類。

打開(kāi)js_register_cocos2dx_Sprite的實(shí)現(xiàn)代碼

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void?js_register_cocos2dx_Sprite(JSContext *cx, JSObject *global) { ????jsb_cocos2d_Sprite_class = (JSClass *)calloc(1,?sizeof(JSClass)); ????jsb_cocos2d_Sprite_class->name =?"Sprite"; ????jsb_cocos2d_Sprite_class->addProperty = JS_PropertyStub; ????jsb_cocos2d_Sprite_class->delProperty = JS_DeletePropertyStub; ????jsb_cocos2d_Sprite_class->getProperty = JS_PropertyStub; ????jsb_cocos2d_Sprite_class->setProperty = JS_StrictPropertyStub; ????jsb_cocos2d_Sprite_class->enumerate = JS_EnumerateStub; ????jsb_cocos2d_Sprite_class->resolve = JS_ResolveStub; ????jsb_cocos2d_Sprite_class->convert = JS_ConvertStub; ????jsb_cocos2d_Sprite_class->finalize = js_cocos2d_Sprite_finalize; ????jsb_cocos2d_Sprite_class->flags = JSCLASS_HAS_RESERVED_SLOTS(2); ????static?JSPropertySpec properties[] = { ????????{0, 0, 0, JSOP_NULLWRAPPER, JSOP_NULLWRAPPER} ????}; ????static?JSFunctionSpec funcs[] = { ????????JS_FN("setSpriteFrame", js_cocos2dx_Sprite_setSpriteFrame, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setTexture", js_cocos2dx_Sprite_setTexture, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("getTexture", js_cocos2dx_Sprite_getTexture, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setFlippedY", js_cocos2dx_Sprite_setFlippedY, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setFlippedX", js_cocos2dx_Sprite_setFlippedX, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("getBatchNode", js_cocos2dx_Sprite_getBatchNode, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("getOffsetPosition", js_cocos2dx_Sprite_getOffsetPosition, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("removeAllChildrenWithCleanup", js_cocos2dx_Sprite_removeAllChildrenWithCleanup, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("updateQuadVertices", js_cocos2dx_Sprite_updateQuadVertices, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("updateTransform", js_cocos2dx_Sprite_updateTransform, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setTextureRect", js_cocos2dx_Sprite_setTextureRect, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("isFrameDisplayed", js_cocos2dx_Sprite_isFrameDisplayed, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("getAtlasIndex", js_cocos2dx_Sprite_getAtlasIndex, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setBatchNode", js_cocos2dx_Sprite_setBatchNode, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setDisplayFrameWithAnimationName", js_cocos2dx_Sprite_setDisplayFrameWithAnimationName, 2, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setTextureAtlas", js_cocos2dx_Sprite_setTextureAtlas, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("getSpriteFrame", js_cocos2dx_Sprite_getSpriteFrame, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("isDirty", js_cocos2dx_Sprite_isDirty, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setAtlasIndex", js_cocos2dx_Sprite_setAtlasIndex, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setDirty", js_cocos2dx_Sprite_setDirty, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("isTextureRectRotated", js_cocos2dx_Sprite_isTextureRectRotated, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("getTextureRect", js_cocos2dx_Sprite_getTextureRect, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("getTextureAtlas", js_cocos2dx_Sprite_getTextureAtlas, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("isFlippedX", js_cocos2dx_Sprite_isFlippedX, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("isFlippedY", js_cocos2dx_Sprite_isFlippedY, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setVertexRect", js_cocos2dx_Sprite_setVertexRect, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("ctor", js_cocos2d_Sprite_ctor, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FS_END ????}; ????static?JSFunctionSpec st_funcs[] = { ????????JS_FN("create", js_cocos2dx_Sprite_create, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("createWithTexture", js_cocos2dx_Sprite_createWithTexture, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("createWithSpriteFrameName", js_cocos2dx_Sprite_createWithSpriteFrameName, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("createWithSpriteFrame", js_cocos2dx_Sprite_createWithSpriteFrame, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FS_END ????}; ????jsb_cocos2d_Sprite_prototype = JS_InitClass( ????????cx, global, ????????jsb_cocos2d_Node_prototype, ????????jsb_cocos2d_Sprite_class, ????????dummy_constructor<cocos2d::Sprite>, 0,?// no constructor ????????properties, ????????funcs, ????????NULL,?// no static properties ????????st_funcs); ????// make the class enumerable in the registered namespace ????JSBool found; ????JS_SetPropertyAttributes(cx, global,?"Sprite", JSPROP_ENUMERATE | JSPROP_READONLY, &found); ????// add the proto and JSClass to the type->js info hash table ????TypeTest<cocos2d::Sprite> t; ????js_type_class_t *p; ????std::string typeName = t.s_name(); ????if?(_js_global_type_map.find(typeName) == _js_global_type_map.end()) ????{ ????????p = (js_type_class_t *)malloc(sizeof(js_type_class_t)); ????????p->jsclass = jsb_cocos2d_Sprite_class; ????????p->proto = jsb_cocos2d_Sprite_prototype; ????????p->parentProto = jsb_cocos2d_Node_prototype; ????????_js_global_type_map.insert(std::make_pair(typeName, p)); ????} }

看起來(lái)比較長(zhǎng)，其實(shí)很簡(jiǎn)單，我們一段一段分析。

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jsb_cocos2d_Sprite_class = (JSClass *)calloc(1,?sizeof(JSClass)); jsb_cocos2d_Sprite_class->name =?"Sprite"; jsb_cocos2d_Sprite_class->addProperty = JS_PropertyStub; jsb_cocos2d_Sprite_class->delProperty = JS_DeletePropertyStub; jsb_cocos2d_Sprite_class->getProperty = JS_PropertyStub; jsb_cocos2d_Sprite_class->setProperty = JS_StrictPropertyStub; jsb_cocos2d_Sprite_class->enumerate = JS_EnumerateStub; jsb_cocos2d_Sprite_class->resolve = JS_ResolveStub; jsb_cocos2d_Sprite_class->convert = JS_ConvertStub; jsb_cocos2d_Sprite_class->finalize = js_cocos2d_Sprite_finalize; jsb_cocos2d_Sprite_class->flags = JSCLASS_HAS_RESERVED_SLOTS(2);

首先，我們構(gòu)造了一個(gè)JSClass對(duì)象，這個(gè)對(duì)象保存了一部分Sprite類的相關(guān)信息（注意，只是一部分而已）。其中包括類名，還有大量函數(shù)的占位符JS_XXXStub，這些函數(shù)是在一定情況下被調(diào)用的，如：添加刪除屬性，查看修改屬性等等。這塊其實(shí)不用特別關(guān)注，因?yàn)槭褂玫亩际荢piderMonkey自帶的缺省實(shí)現(xiàn)。Cocos2d-x引擎只是在最后把finalize函數(shù)替換成自己的函數(shù)了。最后那個(gè)參數(shù)表示這個(gè)類，有幾個(gè)Reserved Slots槽，這東西我們?cè)谥爸v回調(diào)函數(shù)的時(shí)候見(jiàn)過(guò)。

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static?JSPropertySpec properties[] = { ????{0, 0, 0, JSOP_NULLWRAPPER, JSOP_NULLWRAPPER} }; static?JSFunctionSpec funcs[] = { ????JS_FN("setSpriteFrame", js_cocos2dx_Sprite_setSpriteFrame, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setTexture", js_cocos2dx_Sprite_setTexture, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("getTexture", js_cocos2dx_Sprite_getTexture, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setFlippedY", js_cocos2dx_Sprite_setFlippedY, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setFlippedX", js_cocos2dx_Sprite_setFlippedX, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("getBatchNode", js_cocos2dx_Sprite_getBatchNode, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("getOffsetPosition", js_cocos2dx_Sprite_getOffsetPosition, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("removeAllChildrenWithCleanup", js_cocos2dx_Sprite_removeAllChildrenWithCleanup, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("updateQuadVertices", js_cocos2dx_Sprite_updateQuadVertices, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("updateTransform", js_cocos2dx_Sprite_updateTransform, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setTextureRect", js_cocos2dx_Sprite_setTextureRect, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("isFrameDisplayed", js_cocos2dx_Sprite_isFrameDisplayed, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("getAtlasIndex", js_cocos2dx_Sprite_getAtlasIndex, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setBatchNode", js_cocos2dx_Sprite_setBatchNode, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setDisplayFrameWithAnimationName", js_cocos2dx_Sprite_setDisplayFrameWithAnimationName, 2, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setTextureAtlas", js_cocos2dx_Sprite_setTextureAtlas, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("getSpriteFrame", js_cocos2dx_Sprite_getSpriteFrame, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("isDirty", js_cocos2dx_Sprite_isDirty, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setAtlasIndex", js_cocos2dx_Sprite_setAtlasIndex, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setDirty", js_cocos2dx_Sprite_setDirty, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("isTextureRectRotated", js_cocos2dx_Sprite_isTextureRectRotated, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("getTextureRect", js_cocos2dx_Sprite_getTextureRect, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("getTextureAtlas", js_cocos2dx_Sprite_getTextureAtlas, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("isFlippedX", js_cocos2dx_Sprite_isFlippedX, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("isFlippedY", js_cocos2dx_Sprite_isFlippedY, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setVertexRect", js_cocos2dx_Sprite_setVertexRect, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("ctor", js_cocos2d_Sprite_ctor, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FS_END }; static?JSFunctionSpec st_funcs[] = { ????JS_FN("create", js_cocos2dx_Sprite_create, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("createWithTexture", js_cocos2dx_Sprite_createWithTexture, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("createWithSpriteFrameName", js_cocos2dx_Sprite_createWithSpriteFrameName, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("createWithSpriteFrame", js_cocos2dx_Sprite_createWithSpriteFrame, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FS_END };

然后是填寫大量的參數(shù)，包括屬性，靜態(tài)屬性，函數(shù)，靜態(tài)函數(shù)。注意，因?yàn)镃ocos2d-x的類完全使用Setter和Getter，所以一般是沒(méi)有屬性和靜態(tài)屬性的。比較重要的是靜態(tài)函數(shù)和普通函數(shù)。我們看一下宏函數(shù)JS_FN。他的第一個(gè)參數(shù)是函數(shù)名，這個(gè)和C++層的函數(shù)命名是一致的，第二個(gè)參數(shù)在SpiderMonkey調(diào)用JS層對(duì)應(yīng)的C++函數(shù)時(shí)的回調(diào)函數(shù)，這個(gè)函數(shù)我們之前的文章中分析過(guò)。第三個(gè)參數(shù)是函數(shù)調(diào)用時(shí)的參數(shù)個(gè)數(shù)。最后一個(gè)參數(shù)，是一些訪問(wèn)特性，JSPROP_PERMANENT表示不可刪除，JSPROP_ENUMERATE表示在枚舉時(shí)可見(jiàn)（JS的for遍歷）。

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jsb_cocos2d_Sprite_prototype = JS_InitClass( ????cx, global, ????jsb_cocos2d_Node_prototype, ????jsb_cocos2d_Sprite_class, ????dummy_constructor<cocos2d::Sprite>, 0,?// no constructor ????properties, ????funcs, ????NULL,?// no static properties ????st_funcs); // make the class enumerable in the registered namespace JSBool found; JS_SetPropertyAttributes(cx, global,?"Sprite", JSPROP_ENUMERATE | JSPROP_READONLY, &found);

因?yàn)镴S使用的是原型繼承，那么我們需要構(gòu)造一個(gè)原型，需要的參數(shù)也很多，都是我們上面配置好的，上下文，父對(duì)象，原型，JSClass對(duì)象，各種屬性和函數(shù)。然后，會(huì)自動(dòng)把這個(gè)原型設(shè)置為global（就是之前的cc對(duì)象）的一個(gè)屬性。最后，設(shè)置好訪問(wèn)特性。

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TypeTest<cocos2d::Sprite> t; ????js_type_class_t *p; ????std::string typeName = t.s_name(); ????if?(_js_global_type_map.find(typeName) == _js_global_type_map.end()) ????{ ????????p = (js_type_class_t *)malloc(sizeof(js_type_class_t)); ????????p->jsclass = jsb_cocos2d_Sprite_class; ????????p->proto = jsb_cocos2d_Sprite_prototype; ????????p->parentProto = jsb_cocos2d_Node_prototype; ????????_js_global_type_map.insert(std::make_pair(typeName, p)); ????}

最后這段代碼是Cocos2d-x引擎自己做的一個(gè)設(shè)計(jì)，把類型信息存到一個(gè)map里，這個(gè)設(shè)計(jì)以后會(huì)經(jīng)常見(jiàn)到。可以用來(lái)查詢，另外在JS虛擬機(jī)清空時(shí)，也用來(lái)遍歷刪除對(duì)應(yīng)的類型信息。做法是先放到一個(gè)map里，然后cleanup時(shí)遍歷這個(gè)map即可。就不贅述了。

?本文轉(zhuǎn)自 老G 51CTO博客，原文鏈接：http://blog.51cto.com/goldlion/1357617，如需轉(zhuǎn)載請(qǐng)自行聯(lián)系原作者

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