Lua中播放器状态中的变量未按预期更新

playerState = {volume = 50}

function updateVolume(newVolume)
    playerState.volume = newVolume  -- 正确更新全局变量
end

function updateVolumeWrong(newVolume)
    local playerState = {volume = newVolume}  -- 错误：创建了一个局部变量
end

updateVolume(70)
print(playerState.volume)  -- 输出：70

updateVolumeWrong(80)
print(playerState.volume)  -- 输出：70，预期应该是80

playerState = {volume = 50}

function updateVolumeAsync(newVolume)
    local co = coroutine.create(function()
        playerState.volume = newVolume
    end)
    coroutine.resume(co)
end

updateVolumeAsync(70)
print(playerState.volume)  -- 可能输出：50，因为异步操作尚未完成

playerState = {volume = 50}
local mutex = require("mutex")

function updateVolumeThreadSafe(newVolume)
    mutex.lock()
    playerState.volume = newVolume
    mutex.unlock()
end