Cocos Creator 监听安卓屏幕下方返回键

addEscEvent = function(node){
    cc.eventManager.addListener({
        event: cc.EventListener.KEYBOARD,
        onKeyPressed:  function(keyCode, event){
            cc.hb.uiMgr.openPanel("Hall/alertBox/AlertBox",cc.hb.alertMgr.ANIMATE_CENTENT,"确认退出游戏吗？",function(success){
                    if (success){cc.game.end();}
                }
            );
        },
        onKeyReleased: function(keyCode, event){
            if(keyCode == cc.KEY.back){
                cc.log("")
            }
        }
    }, node);
}