今天给大家展示一下点击按钮然后切换场景这个代码

首先创建helloworld的主要框架，然后具体的我再在代码中分析一下

var HelloWorldLayer = cc.Layer.extend({

    _mainUI:null,
    _a:null,
    //
    MAX:6,
    MIN:1,
    _c:null,
    ctor:function () {
        //////////////////////////////
        // 1. super init first
        this._super();
        this._init();
    },
    _init:function() {
        this._a = 4 ;
        this._mainUI = ccs.load(res.Ui_Json).node;
        this.addChild(this._mainUI);
        this._c=this._getWidgetByName(this._mainUI,"Label_5");
        this._setLabString(this._a);
        this._getWidgetByName(this._mainUI,"Button_2").addTouchEventListener(this._leftBtn.bind(this),this._mainUI);
        this._getWidgetByName(this._mainUI,"Button_1").addTouchEventListener(this._rightBtn.bind(this),this._mainUI);
        this._getWidgetByName(this._mainUI,"Button_3").addTouchEventListener(this._startGame.bind(this),this._mainUI);
    },

这里是开始切换场景的一个方法
    _startGame:function(){
        cc.director.runScene(new GameScene());
        //this._a =this._getWidgetByName(this._mainUI,"Button_3");
        //this._a.addTouchEventListener(this._inputHandler.bind(this),this._mainUI);
        //var btn;
        //for(var i = 0;i        //    btn=this._getWidgetByName(this._mainUI,"Button_"+i);
        //    btn.addTouchEventListener(this._inputHandler.bind(this),this._mainUI)
        //}
    },

这是回调方法
    _inputHandler: function (sender,type) {
        if(type==ccui.Widget.TOUCH_ENDED){
            //var str=sender.name.split("Button_")[1];
            if(sender.name == "Button_3") this._changeScene();
            else if(sender.name == "Button_2") this._leftBtn();
            else if(sender.name == "Button_1") this._rightBtn();
        }
    },

其实这是一个拼图游戏裁出来的一部分，这里是左按钮，不做分析
    _leftBtn:function(sender,type){
        if(type==ccui.Widget.TOUCH_ENDED) {
            this._a--;
            if (this._a < this.MIN)  this._a = this.MAX;
            this._setLabString(this._a);
        }
    },

同样的，这里是右按钮
    _rightBtn:function(sender,type){
        if(type==ccui.Widget.TOUCH_ENDED) {
            this._a++;
            if (this._a > this.MAX)  this._a = this.MIN;
            this._setLabString(this._a);
        }
    },

切换场景
    _changeScene:function(){
        var scene =new GameScene();
        cc.director.runScene(scene);
    },

封装的API
    _getWidgetByName:function(par,name){
        return ccui.helper.seekWidgetByName(par,name);
    },
    _setLabString:function(str){
        this._c.setString(str);
    },
    _getLabString:function(){
        return this._c.getString();
    }