javascript 面向对象编程点滴

	    function User(properties){
	    	var _this = this;
	    	for(var i in properties){
	    		(function (){
	    			_this["get" + i] = function() {
	    				return properties[i];
	    			};
	    			_this["set" + i] = function (val){
	    				properties[i] = val;
	    			}
	    		})();
	    	}
	    }