function MainScene:onCreate()
    printf("resource node = %s", tostring(self:getResourceNode()))

    local size = cc.Director:getInstance():getWinSize()

    local x = size.width
    local y = size.height

    local blue = cc.LayerColor:create(cc.c4b(0, 0, 255, 255))--注掉这行看不同的结果
    local red = cc.LayerColor:create(cc.c4b(255, 0, 0, 255))
    local green = cc.LayerColor:create(cc.c4b(0, 255, 0, 255))
    local white = cc.LayerColor:create(cc.c4b(255, 255, 255, 255))

    blue:setScale(0.5)
    blue:setPosition(-x / 4, -y / 4)

    red:setScale(0.5)
    red:setPosition(x / 4, -y / 4)

    green:setScale(0.5)
    green:setPosition(-x / 4, y / 4)

    white:setScale(0.5)
    white:setPosition(x / 4, y / 4)

    self:addChild(blue,10)
    self:addChild(white,11)
    self:addChild(green,12)
    self:addChild(red,13)
    
    local sprite = display.newSprite("ui_force_20001.png")
        :move(display.center)
        :addTo(self, 14)
        :setPosition(0, 0)--注掉这行看不同的结果

    local scheduler = cc.Director:getInstance():getScheduler()

    local function getCurrentResult()

        local x = size.width
        local y = size.height

        local pixelCount = 4
        local i = 1
        local strFmt = ""
        --blue
        local bPixels = gl.readPixels(0,   0,   1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixelCount)
        for i=1,pixelCount do
            local strTmp = string.format("%d:%d ",i,bPixels[i])
            strFmt = strFmt .. strTmp
        end
        print(strFmt)

        if nil ~= schedulEntry then
            scheduler:unscheduleScriptEntry(schedulEntry)
        end
    end
        
    if nil ~= schedulEntry then
        scheduler:unscheduleScriptEntry(schedulEntry)
    end

    schedulEntry = scheduler:scheduleScriptFunc(getCurrentResult, 0.1, false)
end

image.png

image.png

可自行调整代码测试