js 闭包 定时器

; !function (win) {
            var tt1 = 10;  //内部私有 ,
            var tt2 = 20; //内部私有
            //test.prototype.tt1 = 0;//共有变量

            var test = function () {};

            test.prototype.F1 = function (obj1,obj2) {
                
            }
       
            test.prototype.t1 = function (obj1, obj2) {
                console.log(obj1 + "test" + obj2);
            };
            test.prototype.t2 = function (obj1,obj2) {
                var that = this;
                //var timeid = window.setInterval("mytest.t1(obj1,obj2)", 1000 * 2); //未定义
                //var timeid = window.setInterval("mytest.t1('10','2')", 1000 * 2); //执行
                //定时器 需要一个全局参数
                var timeid = window.setInterval("mytest.t1(mytest.tt1,mytest.tt2)", 1000 * 2); //执行, 
            }
            win.mytest = new test(); //继承
        }(window);
        mytest.tt1 = 111;
        mytest.tt2 = 222;
        mytest.t2(15, 16);
        mytest.tt1 = 1110;
        mytest.tt2 = 2220;