Testing weak reference

/**
 * Copyright Fumio ( http://wonderfl.net/user/Fumio )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/xItc
 */

package {
    import flash.display.Sprite;
    import flash.utils.Timer;
    import flash.system.System;
    import flash.text.TextField;
    import flash.text.TextFieldAutoSize;
    import flash.events.Event;
    import flash.events.TimerEvent;
    public class TestingWeakRef extends Sprite {
        private var my_txt:TextField = new TextField();
        public function TestingWeakRef() {
            var myTimer:Timer = new Timer(1);
            addEventListener(Event.ENTER_FRAME, 
                function (eventObject:Event):void {
                    my_txt.text = 
                    String(new Date().time) + ": " + 
                    String(System.totalMemory);
                }, false, 0, true);   // 弱い参照を指定
            my_txt.wordWrap = true;
            my_txt.autoSize = TextFieldAutoSize.LEFT;
            addChild(my_txt);
            myTimer.addEventListener(TimerEvent.TIMER, xTest);
            myTimer.start();
        }
        private function xTest(eventObject:Event):void {
            new TextField();
        }
    }
}