cocos2d-js 3.8监听返回键,进入后台,恢复显示

cc.eventManager.addListener({             event: cc.EventListener.KEYBOARD,             onKeyReleased: function(keyCode, event) {                 if (keyCode == cc.KEY.back) {                    cc.director.end();  //返回键结束程序                }                 else if (keyCode == cc.KEY.menu) {                    }             }}, this);        //进入后台         cc.eventManager.addCustomListener(cc.game.EVENT_HIDE, function(){             //         });        //恢复显示         cc.eventManager.addCustomListener(cc.game.EVENT_SHOW, function(){             //         });