还记得(Remember)在 Windows 95 计算机上按 F5 键刷新吗？这几乎是强迫症。过去(Back)，F1–F12键每个只有一个功能，但现代键盘通常包含额外的功能，您可以使用 Fn 键（也称为功能键(Function key)）访问这些功能。
Fn 键有什么帮助？
Fn 键将F1–F12键变成两用键。从本质上讲，它作为默认热键工作，但略有不同。这些组合因制造商和型号而异。您通常会在笔记本电脑上找到它们（您通常可以在其中更改屏幕亮度等内容），但您也会在一些特殊键盘上找到它们（例如游戏或以生产力为中心的板）。
例如，在戴尔 XPS15z 上，Fn + F5 会增加亮度，而在联想 G560(Lenovo G560)上，相同的组合将显示无线设备设置。
除了F-keys，您还可以将 Fn 键与PgUp、Insert和箭头键等其他键一起使用。将 Fn 与其中一个键结合使用可以方便地执行各种操作，包括调整屏幕亮度(adjusting the screen brightness)、关闭显示器或控制音量等。
但是，有时，您会发现只需按下 F 键（没有 Fn 键）就会触发诸如增加播放音量之类的命令。在这种情况下，您将无法将F 键(F-keys)用于标准键盘快捷键(keyboard shortcuts)，例如按 F5 键进行刷新。
有一个简单的解决方法。您可以通过多种方式修改 Fn 键设置，这就是我们将在本指南中引导您完成的内容。
禁用 Fn 锁定
现代(Modern)台式机和笔记本电脑键盘具有Fn Lock键（即带有锁定图标的键）。在大多数情况下，您会发现Esc键上印有一个锁定图标，但您的键盘也可能在Shift键或Num Lock键上有锁定。
当您按Fn + Esc（或带有锁定图标的键）时，它会切换 Fn 锁定。
完成此操作后，您无需按 Fn 键即可执行调整屏幕亮度或启用和禁用WiFi或蓝牙(Bluetooth)等功能。只需(Simply)按下相关的F 键(F-key)，就可以了。它类似于您使用Caps Lock的方式。启用Caps Lock后，您无需按住Shift键即可输入大写字母。
如果您遇到类似情况但想使用标准F 键(F-keys)，则需要禁用 Fn 锁定。您可以像启用它一样禁用它。按下带有锁定图标的键和 Fn 键。
(Change Fn Key Settings)在Windows中(Within Windows)更改 Fn 键设置
您还可以在操作系统中更改 Fn 键设置。如果您拥有运行Microsoft Windows 10或 8 的(Microsoft Windows 10)戴尔笔记本电脑，您可以从(Dell)Windows Mobility Center更改功能键设置。
按Win + X或右键单击Windows 10上的(Windows 10)开始菜单(Start Menu)按钮以打开电源菜单并选择移动中心(Mobility Center)。或者，您可以转到控制面板(Control Panel)并导航到硬件和声音(Hardware and Sound)> Windows 移动中心(Windows Mobility Center)。
选择Dell Inc. 定制部分下的(Customized by Dell Inc. )Function Key Row选项下的下拉菜单。您将在此处看到两个选项：功能键(Function key)和多媒体键(Multimedia key)。
如果您想使用F 键(F-keys)执行标准功能，请选择功能键(Function key )；如果您想使用F 键(F-keys)执行需要按 Fn 键的功能，请选择多媒体键。(Multimedia key )
同样，在其他制造商的笔记本电脑上，您可能会在其系统配置工具中找到更改功能键选项的选项。例如，在Lenovo上，您可以使用Lenovo 键盘管理器(Lenovo Keyboard Manager)或三星笔记本电脑上的(Samsung)Samsung Settings应用程序来更改功能键行为。
在 BIOS 中更改 Fn 键设置
在大多数情况下，前两种方法应该可以帮助您更改 Fn 键设置，但如果它们没有，您可以使用BIOS设置。
请注意，您不应该乱用任何您不完全理解的设置，因为它会使您的计算机无法启动。
许多（尽管不是全部）笔记本电脑允许您从BIOS或UEFI固件更改 Fn 键设置。您可以通过重新启动进入BIOS设置。当您的计算机仍在启动时，在启动时按 F2(Press F2)、F10或Delete （按键因制造商而异）。(Delete)或者，您可以使用在 Windows 10 上访问 BIOS(accessing the BIOS on Windows 10)的新方法。
此时，您需要环顾四周，因为UEFI设置根据BIOS界面放置在不同的部分下，这在制造商之间有所不同。
例如，在我的 HP 笔记本电脑上，该设置位于系统配置(System Configuration )选项卡下。将操作键模式(Action Keys Mode )更改为启用(Enabled)将使F 键(F-keys)功能正常，即您需要使用 Fn 键和 F 键来执行相关功能。
Fn 键让生活更轻松
如果操作系统升级或设置的意外更改导致您的 Fn 键无法正常工作，则可能会给您带来暂时的烦恼。
但是，Fn 键仍然是键盘上最有用的键之一。它无需点击几下即可获得大量功能，只需按下组合键即可执行它们。
Fn 键也可用于多个Apple键盘。如果它不能正常工作，您也可以在 Mac OS 上解决 Fn 键问题(troubleshoot Fn key problems on Mac OS)。
How to Change Fn Key Settings in Windows 10
Remember hittіng the F5 key to refresh on your Windows 95 compυter? It was almost obsesѕive. Back in the day, the F1–F12 keys had just one function each, but modеrn keyboаrds often include extra functions that you access with an Fn key (also called the Function key).
How are Fn Keys Helpful?
The Fn key turns the F1–F12 keys into dual-purpose keys. Essentially, it works as a default hotkey, but there’s a slight difference. The combinations differ among manufacturers and models. You’ll mostly find them on laptops (where you can usually change things like screen brightness), but you’ll also find them on some specialty keyboards (like gaming or productivity-centric boards).
For instance, on a Dell XPS15z, Fn + F5 increases the brightness, while on a Lenovo G560, the same combination will display the wireless device settings.
In addition to F-keys, you can also use Fn keys with other keys like PgUp, Insert, and arrow keys. Using a combination of Fn along with one of these keys comes in handy for doing a wide range of things, including adjusting the screen brightness, turning off the display, or controlling the volume, among many other things.
However, sometimes, you find that simply pressing an F-key (without the Fn key) triggers a command like increasing the playback volume. In such cases, you’ll be unable to use F-keys for standard keyboard shortcuts like hitting the F5 key for refreshing.
There’s a simple fix for this. You can tinker with the Fn key settings in several ways, and that’s what we’ll walk you through in this guide.
Disable the Fn Lock
Modern desktop and laptop keyboards have an Fn Lock key (i.e., a key with a lock icon). In most cases, you’ll find a lock icon printed on your Esc key, but it’s also possible that your keyboard has the lock on the Shift key or the Num Lock key.
When you press Fn + Esc (or the key with the lock icon), it toggles the Fn lock.
Once you’ve done this, you won’t need to press the Fn key for performing functions like adjusting the screen brightness or enabling and disabling WiFi or Bluetooth. Simply press the relevant F-key, and that should work. It’s similar to how you use Caps Lock. You won’t need to hold the Shift key for typing caps when Caps Lock is enabled.
If you’re experiencing something similar but want to use your standard F-keys, you’ll need to disable the Fn lock. You can disable it the same way as you’d enable it. Press the key with the lock icon along with the Fn key.
Change Fn Key Settings from Within Windows
You can also change Fn key settings from within your operating system. If you own a Dell laptop that runs Microsoft Windows 10 or 8, you can change function key settings from Windows Mobility Center.
Press Win + X or right-click the Start Menu button on Windows 10 to open the power menu and select Mobility Center. Alternatively, you can go to the Control Panel and navigate to Hardware and Sound > Windows Mobility Center.
Select the drop-down menu under the Function Key Row option under the Customized by Dell Inc. section. You’ll see two options here: Function key and Multimedia key.
Select Function key if you’d like to use the F-keys for standard functions, and Multimedia key if you want to use F-keys for performing functions that would otherwise require you to press the Fn key.
Similarly, on laptops from other manufacturers, you might find the option to change function key options in its system configuration tool. For instance, on Lenovo, you can use the Lenovo Keyboard Manager or the Samsung Settings app on a Samsung laptop to change function key behavior.
Change Fn Key Settings in BIOS
In most cases, the previous two methods should help you change Fn key settings, but on the off chance that they didn’t, you can use the BIOS settings.
Note that you shouldn’t mess around with any settings you don’t fully understand because it can render your computer unbootable.
Many, though not all, laptops will allow you to change Fn key settings from the BIOS or UEFI firmware. You can enter your BIOS setup with a reboot. Press F2, F10, or Delete (the keys differ among manufacturers) at the startup when your computer is still booting. Alternatively, you can use the new way of accessing the BIOS on Windows 10.
At this point, you’ll need to look around a little because UEFI settings are placed under different sections based on the BIOS interface, which differs among manufacturers.
For instance, on my HP laptop, the setting is under the System Configuration tab. Changing the Action Keys Mode to Enabled will make the F-keys function like normal, i.e., you’ll need to use the Fn key along with an F-key to perform a relevant function.
Fn Key Makes Life Easy
If an OS upgrade or an accidental change in settings has caused your Fn key to not work as it should, it can cause you momentary annoyance.
However, the Fn key is still one of the most helpful keys on your keyboard. It eliminates a few clicks for plenty of functions and lets you perform them just by pressing a combination of keys.
Fn key is also available on several Apple keyboards. If it’s not working correctly, you can troubleshoot Fn key problems on Mac OS as well.
