通过对bufflao改造

				
				var Buffalo.Cache = {
					
				}
				
				Buffalo.CacheElement = Class.create();
				
				Buffalo.CacheElement.prototype = {
				
					initialize:function(name) {
						this.name = name;
						this.createTime = new Date();
						this.lastAccess = new Date();
					}
					
					idleTime : function() {
						return (new Date()) - this.lastAccess;
					}
					
					
				}