不清晰，貌似update是draw的回调，，，

unction love.run()
if love.math then
love.math.setRandomSeed(os.time())
for i=1,3 do love.math.random() end
end
if love.event then
love.event.pump()
end
if love.load then love.load(arg) end
-- We don't want the first frame's dt to include time taken by love.load.
if love.timer then love.timer.step() end
local dt = 0
-- Main loop time.
while true do
-- Process events.
if love.event then
love.event.pump()
for e,a,b,c,d in love.event.poll() do
if e == "quit" then
if not love.quit or not love.quit() then
if love.audio then
love.audio.stop()
end
return
end
end
love.handlers[e](a,b,c,d)
end
end
-- Update dt, as we'll be passing it to update
if love.timer then
love.timer.step()
dt = love.timer.getDelta()
end
-- Call update and draw
if love.update then love.update(dt) end -- will pass 0 if love.timer is disabled
if love.window and love.graphics and love.window.isCreated() then
love.graphics.clear()
love.graphics.origin()
if love.draw then love.draw() end
love.graphics.present()
end
if love.timer then love.timer.sleep(0.001) end
end
end
看了主流程就懂了吧，update只依赖于update自己，但是draw依赖于window,graphics模块。 另外update里有传dt参数。 如果是draw那传会有些许延迟吧

其实你把别的模块都禁用了 love就是个解释器了，比如做服务器会方便点 虽然不效率 呵呵~