Node之remove and clean

local Test5_entry = nil
local Test5_layer = nil

local function Test5_addAndRemove(dt)
    local sp1 = Test5_layer:getChildByTag(kTagSprite1)
    local sp2 = Test5_layer:getChildByTag(kTagSprite2)

    sp1:retain()
    sp2:retain()//此函數的作用是給引用計數加一，防止remove的時候釋放sp2

    Test5_layer:removeChild(sp1, false)
    Test5_layer:removeChild(sp2, true)//清除標誌爲true會把sp2的動作停下

    Test5_layer:addChild(sp1, 0, kTagSprite1)
    Test5_layer:addChild(sp2, 0, kTagSprite2) //如果sp2:retain()註釋掉的話，此時addChild的sp2是個空值

    sp1:release()
    sp2:release()
end

local function Test5_onEnterOrExit(tag)
    if tag == "enter" then
        Test5_entry = scheduler:scheduleScriptFunc(Test5_addAndRemove, 2.0, false)
    elseif tag == "exit" then
        scheduler:unscheduleScriptEntry(Test5_entry)
    end
end

local function Test5()
    Test5_layer = getBaseLayer()

    local sp1 = cc.Sprite:create(s_pPathSister1)
    local sp2 = cc.Sprite:create(s_pPathSister2)

    sp1:setPosition(cc.p(100, 160))
    sp2:setPosition(cc.p(380, 160))

    local rot = cc.RotateBy:create(2, 360)
    local rot_back = rot:reverse()
    local forever = cc.RepeatForever:create(cc.Sequence:create(rot, rot_back))

    local rot2 = cc.RotateBy:create(2, 360)
    local rot2_back = rot2:reverse()
    local forever2 = cc.RepeatForever:create(cc.Sequence:create(rot2, rot2_back))

    forever:setTag(101)
    forever2:setTag(102)//setTag的作用就是設置標籤，標籤可以是任意玩意

    Test5_layer:addChild(sp1, 0, kTagSprite1)
    Test5_layer:addChild(sp2, 0, kTagSprite2)

    sp1:runAction(forever)
    sp2:runAction(forever2)

    Test5_layer:registerScriptHandler(Test5_onEnterOrExit)

    Helper.titleLabel:setString("remove and cleanup")
    return Test5_layer
end