js mvc设计模式

var myapp = {
    
    }; // 创建这个应用对象

myapp.Model = function() {
    
    
    var val = 0;

    this.add = function(v) {
    
    
        if (val < 100) val += v;
    };

    this.sub = function(v) {
    
    
        if (val > 0) val -= v;
    };

    this.getVal = function() {
    
    
        return val;
    };

    var self = this, 
        views = [];

    this.register = function(view) {
    
    
        views.push(view);
    };
    this.notify = function() {
    
    
        for(var i = 0; i < views.length; i++) {
    
    
            views[i].render(self);
        }
    };
};

myapp.View = function(controller) {
    
    
    var $num = $('#num'),
        $incBtn = $('#increase'),
        $decBtn = $('#decrease');

    this.render = function(model) {
    
    
        $num.text(model.getVal() + 'rmb');
    };

    /*  绑定事件  */
    $incBtn.click(controller.increase);
    $decBtn.click(controller.decrease);
};

myapp.Controller = function() {
    
    
    var model = null,
        view = null;

    this.init = function() {
    
    
        /* 初始化Model和View */
        model = new myapp.Model();
        view = new myapp.View(this);

        /* View向Model注册，当Model更新就会去通知View啦 */
        model.register(view);
        model.notify();
    };

    /* 让Model更新数值并通知View更新视图 */
    this.increase = function() {
    
    
        model.add(1);
        model.notify();
    };

    this.decrease = function() {
    
    
        model.sub(1);
        model.notify();
    };
};

(function() {
    
    
    var controller = new myapp.Controller();
    controller.init();
})();