单例模式

var singleton = function(){
    //私有
    var priVar = 10;

    function priFun(){
        return false;
    }

    //公有
    return {
        publicProperty: true,
        publicMethod: function(){
            priVar++;
            return priFun();
        }
    };
}(); //初始化函数

document.writeln(singleton.publicProperty);

function BaseComponet(){

}

var application = function(){
    // 私有
    var privateVar = 10;
    var privateMethod = function(){
        return false;
    }

    var components = new Array();

    var app = new BaseComponet(); //自定义的   
    
    //公共接口
    app.getComponent = function(){
        return components.length;
    }

    app.registerComponent = function(component){
        if(typeof component == "object"){
            components.push(component);
        }
    }
    return app; // 初始化时将app的引用赋给application
}(); // 初始化