//装饰器模式function a(){    console.log('a');}function b(){    console.log('b');}function log(fun){        console.log(new Date());        fun.call(null);        console.log(new Date());}// a();//=> new date(),a,new date();// b();log(a);

//单列模式var Singleton = (function(){    var singleton = null;    function init(){        return new Object();    }    return {        getInstance:function(){            if(!singleton){                singleton = init();            }            return singleton;        }    }})();Singleton.getInstance();Singleton.getInstance();Singleton.getInstance();

//备忘录模式，如缓存机制