Native NotificationCenter will never notify event to js since `m_scriptHandler` is only used for `LUABinding`.
If you want to use `cc.NotificationCenter`, just copy the implementation of that in cocos2d-html5. It's also pure js and it's compatible with `cocos2d-html5`. 
<pre>
void CCNotificationCenter::postNotification(const char *name, CCObject *object)
{
...
    if (m_scriptHandler) // 
    {
        CCScriptEngineProtocol* engine = CCScriptEngineManager::sharedManager()->getScriptEngine();
        engine->executeNotificationEvent(this, name);
    }
}
</pre>