Adding features to a devcontainer.json file

功能是指安装代码和开发容器配置的独立单元，其设计目的是跨各种基本容器映像工作。可以使用功能将工具、运行时或库快速添加到 codespace 映像。有关详细信息，请参阅 containers.dev 上的可用功能和功能规范。

可以从 VS Code 或 GitHub.com 上的存储库向 devcontainer.json 文件添加功能。 Use the tabs in this article to display instructions for each of these ways of adding features.

Adding features to a `devcontainer.json` file

Navigate to your repository on GitHub.com, find your devcontainer.json file, and click to edit the file.

If you don't already have a devcontainer.json file, you can create one now. For more information, see "Introduction to dev containers."
To the right of the file editor, in the Marketplace tab, browse or search for the feature you want to add, then click the name of the feature.
Under "Installation," click the code snippet to copy it to your clipboard, then paste the snippet into the features object in your devcontainer.json file.
```
"features": {
     ...
     "ghcr.io/devcontainers/features/terraform:1": {},
     ...
}
```
By default, the latest version of the feature will be used. To choose a different version, or configure other options for the feature, expand the properties listed under "Options" to view the available values, then add the options by manually editing the object in your devcontainer.json file.
```
"features": {
     ...
     "ghcr.io/devcontainers/features/terraform:1": {
         "version": "1.1",
         "tflint": "latest"
     },
     ...
}
```
Commit the changes to your devcontainer.json file.

The configuration changes will take effect in new codespaces created from the repository. To make the changes take effect in existing codespaces, you will need to pull the updates to the devcontainer.json file into your codespace, then rebuild the container for the codespace. For more information, see "Introduction to dev containers."

To add features in VS Code while you are working locally, and not connected to a codespace, you must have the "Dev Containers" extension installed and enabled. For more information about this extension, see the VS Code Marketplace.

使用 Shift+Command+P (Mac) 或 Ctrl+Shift+P (Windows/Linux) 访问 VS Code Command Palette。
Start typing "configure" and click Codespaces: Configure Dev Container.
Click Modify your active configuration.
Update your feature selections, then click OK.
If you're working in a codespace, a prompt will appear in the lower-right corner. To rebuild the container and apply the changes to the codespace you're working in, click Rebuild Now.