但如果需要测试多个条件，例如我们假设所有条件都需要为 True 或 False (AND)，或只有一个条件需要为 True 或 False (OR)，或者如果想要检查某个条件是否不 (NOT) 符合你的条件，这时该怎么做呢？这三个函数均可以单独使用，但它们更常见于与 IF 函数成对使用。

Get help with signing in, changing passwords, creating and sending mail, deleting mail, creating folders, and more in Outlook on the web.

Get started with basic tasks in Excel such as opening a workbook, entering and formatting data, calculating data, and trying some quick analysis features..

Step 2: Back up your folders. Windows Backup is an easy, single stop for all of your backup needs. Your free Microsoft account comes with 5 GB of OneDrive cloud storage (and more storage is available if you need it), and backing up your folders syncs the folders you specify to your OneDrive account, making them instantly accessible on all computers that you use with this Microsoft account.

Find out how to use Game Bar to capture game play, chat with friends, track achievements, and more.

For Wi-Fi connection. Select Start > Settings > Network & internet > Wi-Fi and then select the Wi-Fi network you're connected to.

你可以使用安装介质（U 盘或 DVD）来安装 Windows 的新副本、执行全新安装或重新安装 Windows。 要创建安装介质，请转到软件下载网站，你可以在这里找到分步说明。 在该网站上，你可以选择 Windows 版本，并使用 U 盘或 DVD 创建自己的安装介质。

Is it available on my device? BitLocker encryption is available on supported devices running Windows 10 or 11 Pro, Enterprise, or Education. On supported devices running Windows 10 or newer BitLocker will automatically be turned on the first time you sign into a personal Microsoft account (such as @outlook.com or @hotmail.com) or your work or school account.

Get answers to all of your Microsoft Word questions. Find Word help, how-to articles, training videos, tutorials, and more.

If you're having trouble launching Microsoft Store, here are some things to try: Reset the Microsoft Store cache: Press the Windows Logo Key + R to open the Run dialog box, type wsreset.exe, and then select OK.