如何使用罗技 LUA 脚本

我正在尝试有两个输入，会有一个输出。这是为了我能在游戏中使用某个技能。谢谢如果你能帮忙。

function OnEvent(event, arg)
     if event == "MOUSE_BUTTON_PRESSED" and arg == 2 then --设置 mb2 标志
            mb2_pressed = true
    elseif event == "MOUSE_BUTTON_RELEASED" and arg == 2 then --设置 mb2 标志为 false
        mb2_pressed = false
    else if event == "LSHIFT_BUTTON_PRESSED" and arg == 1 then
    leftshift_pressed = true
    else if event == "LSHIFT_BUTTON_RELEASED" and arg == 1 then
    leftshift_pressed = false
    end
end

if leftshift_pressed and  if mb2_pressed then
presskey("9")
        Sleep(50)
        releasekey("9")
end
end

https://gyazo.com/7e7f2139fabb22d1e06f8f3f169cb4bb