AS3 注意点

当主类new 一个主影片来放内容的时候。在gc此swf时，一定要检查此主影片是否存在，如

private function initStart()
		{
			//trace("RightMenu类 ->initStart() 开始程序");
			isShowMLoading(false);

			mainMh_mc = new Main_dt();
			this.addChild(mainMh_mc);

			isShowWordBg(false);

			rightMenuBtn = [mainMh_mc["YB"], mainMh_mc["BS"], mainMh_mc["CZ"], mainMh_mc["KP"], mainMh_mc["YX"]];

			addBtnEvent();

			oldClickMenu = mainMh_mc["KP"];
			loadTargetSwf();
		}

　　

private function addBtnEvent(_isAdd:Boolean = true )
		{
			//mainMh_mc["backBtn"].backFunction = clickHdl;

			if (mainMh_mc)
			{
				if (_isAdd)
				{
					mainMh_mc["backHome"].clickHdl = backClickHdl;
					mainMh_mc["backBtn"].clickHdl = backClickHdl;
				}
				else
				{
					mainMh_mc["backHome"].gc();
					mainMh_mc["backBtn"].gc();
				}
			}

			for (var i in rightMenuBtn)
			{
				if (_isAdd)
				{
					rightMenuBtn[i].clickHdl = menuClikHdl;
				}
				else
				{
					rightMenuBtn[i].gc();
				}
			}

		}