先在影片剪辑中给按钮命实例名为back_btn，然后把影片拖入主场景，把拖入的这个影片剪辑命实例名为back_mc,接下这样下back_mc.back_btn.addEventListener(MouseEvent.CLICK,backSence)function backSence(e:MouseEvent){gotoAndStop(1,"场景名")}
