看似递归的不是递归，是缓存之前的函数

看似递归的不是递归，是缓存之前的函数

(function () {
    var Button = function(label, color){
        this.initialize(label, color);
    };
    var p = Button.prototype = new createjs.Container();
    p.label;
    p.background;
    p.count = 0;
    
    p.Container_initialize = p.initialize; // 这个是缓存之前的函数；
    p.initialize = function(label,color){  //重新定义了这个函数； 
        this.Container_initialize();       //调用了之前缓存的函数
        this.label = label;
        if(!color) {
            color ='#ccc';
        }
        
        var text = new createjs.Text(label, '20px Arial','#000');
        text.textBaseline = 'top';
        text.textAlign = 'center';
        
        var width = text.getMeasuredWidth() + 30;
        var height = text.getMeasuredHeight() + 20;
        
        this.background = new createjs.Shape();
        this.background.graphics.beginFill(color).drawRoundRect(0,0,width,height,10);
        
        text.x = width /2;
        text.y = 10;
        
        this.addChild(this.background, text);
        this.on('click', this.handleClick);
        this.on('tick', this.handleTick);
        
        this.mouseChildren = false;
    };
    
    p.handleClick = function(event){
        var target = event.target;
        alert('You clicked on a button: '+ target.label);
    };
    
    p.handleTick = function (event) {
        p.alpha = Math.cos(p.count++*0.1)*0.4+0.6;
    };
    
    window.Button = Button;
}());