Apple doesn’t have a written policy that guarantees how long it supports each release of macOS with security updates. But you can quickly check to see which versions of macOS Apple is still updating, and they tend to support the most recent three versions.

Apple没有书面政策来保证它支持每个带有安全更新的macOS版本多长时间。 但是您可以快速查看一下Apple仍在更新哪些macOS版本，它们倾向于支持最新的三个版本。

苹果没有正式的书面政策 (Apple Has No Official Written Policy)

Apple doesn’t provide a written statement that guarantees how long it will support each release of macOS with security updates. Apple doesn’t even publicly say when an operating system is “end of life” and is no longer receiving updates. They just stop releasing updates for old versions of macOS with no announcement, and you’re on your own.

苹果没有提供书面声明来保证它将支持每个带有安全更新的macOS版本多长时间。 苹果甚至没有公开说操作系统何时“寿命终止”并且不再接收更新。 他们只是停止发布旧版本的macOS的更新而没有发布通知，而您是一个人。

This is very unusual if you’re used to dealing with Microsoft Windows. Microsoft publishes their , which spells out precisely (and guarantees) how long each product will receive different types of updates. For example, you can see on that page that for Windows 7 Service Pack 1, mainstream support (new feature releases and minor updates) ended in 2015, but extended support (security updates) goes on until 2020.

如果您习惯使用Microsoft Windows，这是非常不寻常的。 微软发布了他们的 ，该精确地(并保证了)每种产品将收到不同类型的更新的时间。 例如，您可以在该页面上看到，对于Windows 7 Service Pack 1，主流支持(新功能发布和次要更新)已在2015年终止，而扩展支持(安全更新)一直持续到2020年。

Apple does still has a plan, though, even if they don’t describe it publicly. For quite a few years, Apple has consistently updated the last three versions of macOS—in other words, the current release of macOS and the last two releases—with security updates. So, assuming Apple releases a new version of macOS every year, each release of macOS will be supported with security updates for roughly three years. But Apple provides no guarantees, and that’s just an informed guess.

即使苹果没有公开描述它，苹果仍然有一个计划。 多年来，Apple不断更新了macOS的最后三个版本(换句话说，macOS的当前版本和最后两个版本)并进行了安全更新。 因此，假设苹果每年发布一个新版本的macOS，则每个版本的macOS都会获得大约三年的安全更新支持。 但是苹果公​​司不提供任何保证，这仅仅是一个明智的猜测。

如何查看当前支持的内容 (How to See What’s Currently Supported)

The page is the only page on Apple’s website that gives you this information. It contains a list of security updates Apple has recently released for all its devices, including Macs running macOS. Look for the most recent macOS update and check which versions of macOS it was released for. If a version of macOS isn’t receiving new updates, it isn’t supported anymore.

页面是Apple网站上唯一提供此信息的页面。 它包含Apple最近为其所有设备(包括运行macOS的Mac)发布的安全更新的列表。 查找最新的macOS更新，并检查其发行的macOS版本。 如果macOS版本没有收到新更新，则不再支持它。

For example, in May 2018, the latest release of macOS was macOS 10.13 High Sierra. This release is supported with security updates, and the previous releases—macOS 10.12 Sierra and OS X 10.11 El Capitan—were also supported. When Apple releases macOS 10.14, OS X 10.11 El Capitan will very likely no longer be supported. That’s what we can assume based on Apple’s past actions, anyway.

例如，在2018年5月，macOS的最新版本是macOS 10.13 High Sierra。 此更新受安全更新支持，并且还支持以前的版本(macOS 10.12 Sierra和OS X 10.11 El Capitan)。 当Apple发布macOS 10.14时，很有可能将不再支持OS X 10.11 El Capitan。 无论如何，我们可以根据苹果公司过去的行动来假设这一点。

如何检查您正在运行的macOS版本 (How to Check Which Release of macOS You’re Running)

To , click the Apple icon on the menu bar at the top of your screen, and then click the “About This Mac” command. You’ll see the name of the release you’re using and the version number right below that.

要 ，请单击屏幕顶部菜单栏上的Apple图标，然后单击“关于本机”命令。 您会在下面看到正在使用的发行版的名称和版本号。

If you have an older minor release—for example, if you have macOS 10.13.3 and you see that only macOS 10.13.4 is supported with updates—you just need to open the Mac App Store and install any updates to get the most recent minor version.

如果您使用的是较早的次要发行版(例如，如果您具有macOS 10.13.3，并且看到更新仅支持macOS 10.13.4)，则只需打开Mac App Store并安装所有更新以获取最新版本即可。次要版本。

如何升级到受支持的版本 (How to Upgrade to a Supported Release)

You can always for free, assuming Apple still supports your hardware. Launch the App Store app on your Mac and you should see the new version of macOS available as a free download. It’s a good idea to before continuing.

假设Apple仍然支持您的硬件，您始终可以免费 。 在Mac上启动App Store应用程序，您应该可以免费下载新版本的macOS。 继续操作之前， 是个好主意。

You can also click the “Software Update” button in the About This Mac window to open the app.

您也可以在“关于本机”窗口中单击“软件更新”按钮以打开应用程序。

Image Credit: /Shutterstock.com.

图片来源： /Shutterstock.com。

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