键盘事件，自定义事件

/**
* Created by cena on 2017/4/4.
*/
var MyLayer=cc.Layer.extend({
_topDisplayLabel:null,
_item1Count:null,
ctor:function() {
this._super();
var size=cc.winSize;
var button =new ccui.Button();
button.attr({
x:size.width/2,
y:size.height/2
});
this._topDisplayLabel=new cc.LabelTTF("this is a button test","Arial",32);
this._topDisplayLabel.attr({
x:size.width/2,
y:size.height/2+150
});
this.addChild(this._topDisplayLabel);
this._item1Count=1;

var _listener=cc.EventListener.create({
event:cc.EventListener.CUSTOM,
eventName:"game_custom_event",
callback:function (event) {
var label=event.getCurrentTarget();
label.setString("Custom event "+event.getUserData()+" received times");
cc.log("received");
}
});
cc.eventManager.addListener(_listener,this._topDisplayLabel);

cc.eventManager.addListener({
event:cc.EventListener.KEYBOARD,
onKeyPressed:function (keycode,event) {
var label=event.getCurrentTarget();
label.setString("key pressed");

var event = new cc.EventCustom("game_custom_event");
event.setUserData("1");
cc.eventManager.dispatchEvent(event);
},
onKeyReleased:function (keycode,event) {
var label=event.getCurrentTarget();
label.setString("key released");
}
},this._topDisplayLabel);

return true;
}
});
var  myscene=cc.Scene.extend({
onEnter:function()
{
this._super();
var layer=new MyLayer();
this.addChild(layer);
}
});