如果您是电脑或笔记本电脑的日常用户，那么您应该了解键盘上功能键的功能。它们在当今非常重要。
函数键是键盘上的键，它使操作系统命令解释器或应用程序在屏幕上执行某些操作。键盘上有12个键，从F1到F12。所有按键都具有不同的功能。如果您使用的是笔记本电脑，则必须同时按下 Fn 键和 F1 到 F12 之间的其他键才能使用。
如何启用 Fn 键与函数键一起使用？
启动笔记本电脑，然后转到 Bios 设置，然后将光标移动到系统配置。您将找到操作键模式选项，并在同一屏幕上，您将获得有关如何禁用或启用 Fn 键的信息。如果您不启用 Fn 键，则函数键也将起作用，但不会以它们的方式起作用。因此，启用 Fn 键是个好主意，同时按 Fn 键与函数键一起使用效果会更好。
从 F1 到 F12 的键也称为操作键。我们将一一了解这些按键的功能。
| Key | Function |
|---|---|
| F1 | This key is used to open help center. If you are using keyboard of your computer, then only pressing F1 will work, but if you are using your laptop keyboard then pressing Function key (FN) with F1 will open help center. With this help center, if you want to know about any software or application or anything you can get help from there. |
| F2 | This key is used to rename folder or file. If you want to change name of folder, then you don’t have to right-click on it, and then find rename option. You can simply click F2, and it will work properly. This function key will save time of use. |
| F3 | This key is used to search application on computer or laptop. If you are doing it on your laptop, then pressing function key (FN) and F3 together will work. It will take you to search box where you can search application. Another use of F3 is that if you want to search text while using web browser, then also this key is used to search text. |
| F4 | This key does not work alone. Pressing only F4 will not work whether it is on computer or laptop. Pressing Alt + F4 together works to close current application which is open on screen. Also, pressing both keys together while on desktop screen, then there shut down, restart option appears. |
| F5 | This key is used to refresh screen. When you want to refresh screen, you have to go to desktop screen and then click refresh button, but F5 will simply do this work. Going to web browser, you want to refresh that website or that screen, F5 will refresh that. This will save time of user. |
| F6 | This key is used to decrease volume if you are using this on laptop. If you are searching on web browser, and want to jump to any URL, then F6 will work. |
| F7 | This key is used basically in MS Office apps like powerpoint, excel to find grammar mistakes in it. |
| F8 | This key is used to go in safe mode. For example, if you are starting your laptop, then pressing F8 there will help you to go in safe mode. If you are using this key on Word, then all text in Word will be selected. |
| F9 | This key alone has no work in Windows. It is basically used in MS Word with Alt and Shift. |
| F10 | This key also does not have any use in Windows. It is used in MS Word with Shift. Pressing these both keys together, shortcut menu appears on screen. |
| F11 | This key is used for full screen. If you want to use your browser then open that browser and press F11, for full-screen mode and can be get back to original screen by pressing ESC. |
| F12 | When pressed, without FN key on laptop, then laptop will go in flight mode. This key basically does not have any use on computers. It is used in MS Word. When pressed, it automatically shows dialog box to save file. |
所以，这些是每个函数键的基本功能。