event.isAltDown

概述

指示在发生按键事件时是否按住 Alt 键。请注意，如果刚刚按下的键是 `leftAlt` 或 `rightAlt`，则此属性保证返回 `true`。

示例

-- Called when a key event has been received
local function onKeyEvent( event )
    if ( event.isAltDown ) then
        -- The Alt key was held down for the given key
    else
        -- The Alt key was not held down for the given key
    end
    return false
end

-- Add the key event listener
Runtime:addEventListener( "key", onKeyEvent )