// do_task(每次间隔毫秒时间，路径，线程名，运行次数);

var thread_manager = new threader();
thread_manager.do_task(1000, _root, "calleeA", 4);
var thread_manager2 = new threader();
thread_manager2.do_task(1500, _root, "calleeB", 3);
function calleeA() { t_txt.text +="A\r"	}
function calleeB() { t_txt.text +="B\r"	}

this.createTextField("t_txt",0,0,0,Stage.width,Stage.height);