targetMC=fl.getDocumentDOM().getTimeline().layers [0].frames[0].elements[0]; fl.getDocumentDOM().library.selectItem(targetMC.libraryItem.name); fl.getDocumentDOM().library.editItem(); targetMcTimeLine=fl.getDocumentDOM().getTimeline().layers[0].frames;
fl.getDocumentDOM().exitEditMode();
原文：https://www.cnblogs.com/dt1991/p/10622716.html