对象转化成数组并使用遍历循环出数据

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var Place = function (title) {
		    this.title = title;  
		};
		
		//实例化Place对象
		var kitchen = new Place("The Kitchen");
		var dungeon = new Place("The Dungeon");
		
		var exits = {};
		//exits对象的north属性对应的值是一个实例化之后的kitchen对象
		exits["north"] = kitchen;
		exits["the trapdoor"] = dungeon;
		
		//将对象exits转化为数组的形式
		var keys = Object.keys(exits);
		//对数组遍历
		keys.forEach(function (key) {
		    console.log(key + " goes to " + exits[key].title);
		});