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鍍金池/ 教程/ C/ 注冊函數(shù)
cocos2d-x for js 中的繼承
JS 與 C++ 的交互 1——JS 代碼調(diào)用 C++ 代碼
迎接腳本時代的到來
解決在 vs 中修改 js 源文件無效
JS 腳本語言的優(yōu)勢與一些問題
注冊函數(shù)
回調(diào)函數(shù) 2
cxx-generator JS 綁定工具
使用 cocos2d-console 工具轉(zhuǎn)換腳本為字節(jié)碼
hybrid 開發(fā)模式
JS 與 C++ 的交互 2——JS 與 C++ 的“函數(shù)重載”問題
回調(diào)函數(shù)1——按鍵回調(diào)
Google 的繼承寫法解析
John Resiq 的繼承寫法解析
JS 與 C++ 的交互 3——C++ 和 JS 類型轉(zhuǎn)換
傀儡構(gòu)造函數(shù)

注冊函數(shù)

前面的文章中講過，在游戲啟動時，會調(diào)用大量的 addRegisterCallback 函數(shù)，向 SpiderMonkey 注冊 Cocos2d-x 引擎的函數(shù)。

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 注冊函數(shù)為例，跳轉(zhuǎn)到實(shí)現(xiàn)代碼：

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象中獲取一個“cc”屬性（如果獲取不到，就新建一個），因?yàn)?JS 中沒有名字空間的概念，所以我們使用一個 cc 對象來表示類似的功能。所有的類型和函數(shù)都是這個 cc 對象下面的屬性。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)，每個函數(shù)都負(fù)責(zé)注冊一個對應(yīng)的類。打開 js_register_cocos2dx_Sprite，這個函數(shù)負(fù)責(zé)注冊 Sprite 類。

打開 js_register_cocos2dx_Sprite 的實(shí)現(xiàn)代碼

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));
    }
}

看起來比較長，其實(shí)很簡單，我們一段一段分析。

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;

首先，我們構(gòu)造了一個 JSClass 對象，這個對象保存了一部分 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?SpiderMonkey 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。最后那個參數(shù)表示這個類，有幾個 Reserved Slots 槽，這東西我們在之前講回調(diào)函數(shù)的時候見過。

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)?Cocos2d-x 的類完全使用 Setter 和 Getter，所以一般是沒有屬性和靜態(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。他的第一個參數(shù)是函數(shù)名，這個和 C++ 層的函數(shù)命名是一致的，第二個參數(shù)在 SpiderMonkey 調(diào)用 JS 層對應(yīng)的 C++ 函數(shù)時的回調(diào)函數(shù)，這個函數(shù)我們之前的文章中分析過。第三個參數(shù)是函數(shù)調(diào)用時的參數(shù)個數(shù)。最后一個參數(shù)，是一些訪問特性，JSPROP_PERMANENT 表示不可刪除，JSPROP_ENUMERATE 表示在枚舉時可見（JS 的 for 遍歷）。

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)?JS 使用的是原型繼承，那么我們需要構(gòu)造一個原型，需要的參數(shù)也很多，都是我們上面配置好的，上下文，父對象，原型，JSClass 對象，各種屬性和函數(shù)。然后，會自動把這個原型設(shè)置為 global（就是之前的 cc 對象）的一個屬性。最后，設(shè)置好訪問特性。

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 引擎自己做的一個設(shè)計(jì)，把類型信息存到一個 map 里，這個設(shè)計(jì)以后會經(jīng)常見到?？梢杂脕聿樵?，另外在 JS 虛擬機(jī)清空時，也用來遍歷刪除對應(yīng)的類型信息。做法是先放到一個 map 里，然后 cleanup 時遍歷這個 map 即可。就不贅述了。