jsb中js继承c++对象有bug

Cocos2d-x JavaScript
#1 
var HitZoneAnimation = sp.SkeletonAnimation.extend({
        ctor:function(skeletonDataFile, atlasFile/* or atlas*/, scale){    
            var r = this._super();
            this.initWithFile(skeletonDataFile, atlasFile, scale);
            this.initialize();        
        }
});

var HelloWorldLayer = cc.Layer.extend({
    sprite:null,
    ctor:function () {
        //////////////////////////////
        // 1. super init first
        this._super();

     
        var self = this;
        var s1 =  new HitZoneAnimation("res/animation/yecha_da.json", "res/animation/yecha_da.atlas", 1);
        self.addChild(s1);
        s1.setPosition(cc.p(500,200));
    
        return true;
    }
});

var HelloWorldScene = cc.Scene.extend({
    onEnter:function () {
        this._super();
        var layer = new HelloWorldLayer();
        this.addChild(layer);
    }
});

```



这段代码会报错:
JS: sp.SkeletonAnimation.prototype._ctor,undefined,undefined,undefined, {}
jsb: ERROR: File  jsb_cocos2dx_spine_auto.cpp: Line: 370, Function: js_cocos2dx_spine_SkeletonRenderer_initWithFile
js_cocos2dx_spine_SkeletonRenderer_initWithFile : Invalid Native Object
JS:app.js:5:Error: js_cocos2dx_spine_SkeletonRenderer_initWithFile : Invalid Native Object
跟踪了下跟踪一下发现是jsb里对js的this处理有问题.请官方提供个解决方案.
#2

JS: sp.SkeletonAnimation.prototype._ctor,undefined,undefined,undefined, {} 这句话是我特意加打印的日志.

sp.SkeletonAnimation.prototype._ctor = function(skeletonDataFile, atlasFile, scale) {
    cc.log("sp.SkeletonAnimation.prototype._ctor,%s,%s,%s, %s", skeletonDataFile, atlasFile, scale, JSON.stringify(this));
    this.retain();
    if(atlasFile) {
        if (isNaN(scale)) {
            scale = 1;
        }
        
        //sp.SkeletonAnimation.prototype.init.call(this);
        sp.SkeletonAnimation.prototype.initWithFile.call(this, skeletonDataFile, atlasFile, scale);
        sp.SkeletonAnimation.prototype.initialize.call(this);

        this._target = null;
        this._callback = null;
        cc.log("sp.SkeletonAnimation.prototype._ctor finish");
    }
};


```