参看director帮助，使用avi的duration属性

property spriteNum
on exitFrame me
    myMember = sprite(spriteNum).member
    myDuration = member(myMember).duration
    myMovietime = sprite(spriteNum).movieTime
    if myDuration > myMovietime then
        go to the frame
    else
        go to the frame + 1
    end if

end