quick -- 建立精灵和动做

    local imgBg = display.newSprite("666666.jpg")
        :pos(display.cx, display.cy)
        :addTo(self)
        
    local move1 = cc.MoveBy:create(0.5, cc.p(0, 10))
    local move2 = cc.MoveBy:create(0.5, cc.p(0, -10))
    local SequenceAction = cc.Sequence:create( move1, move2 )
    transition.execute(imgBg, cc.RepeatForever:create( SequenceAction ))