图像赢得'；不要在Lua L和xD6中移动；虚拟游戏

我正在Lua LÖVE框架下为LudumDare26编写一个游戏。我似乎不明白为什么我的“播放器”在按下WASD键时不动

function love.draw()

    playerX = 10
    playerY = 10

    if love.keyboard.isDown ("w") then
        playerY = playerY - 1
    elseif love.keyboard.isDown ("s") then
        playerY = playerY + 1
    elseif love.keyboard.isDown ("a") then
        playerX = playerX - 1
    elseif love.keyboard.isDown ("d") then
        playerX = playerX + 1
    end

    local x = love.mouse.getX()
    local y = love.mouse.getY()

    love.graphics.setColor(0, 200, 255, 100)
    love.graphics.rectangle("fill", 0, 0, 800, 300)

    love.graphics.setColor(255, 255, 255, 255)
    love.graphics.rectangle("fill", xCloud, 128, 128, 50)

    love.graphics.setColor(50, 160, 80, 255)
    love.graphics.rectangle("fill", 0, 300, 800, 300)

    love.graphics.setColor(255, 0, 0, 255)
    love.graphics.draw(corsair, x - 16, y - 16, 0, 1, 1, 0, 0)

    love.graphics.draw(player, playerX, playerY)

    love.graphics.line(playerX, playerY, x, y)
end

---

从

love.draw（）方法中去掉这些行：

playerX = 10
playerY = 10