将元件进入影片和退出影片

targetMC= lay [0].frames[0].elements[0];
			targetMC.name="mh_mc";
			keyFrame_arr.length=0;
			label_arr.length=0;
	
			fl.getDocumentDOM().library.selectItem(targetMC.libraryItem.name);
			fl.getDocumentDOM().library.editItem();

fl.getDocumentDOM().exitEditMode();