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---
id: special-non-dom-attributes-zh-CN
title: 特殊的 Non-DOM Attributes
permalink: docs/special-non-dom-attributes-zh-CN.html
prev: dom-differences-zh-CN.html
next: reconciliation-zh-CN.html
---

和 [DOM 的不同之处](/react/docs/dom-differences-zh-CN.html)相比, React 提供了一些不存在于DOM的 attributes .

- `key`: 一个可选的.独特的标识.当你的组件穿梭于 `render` 的pass,它也许会因为diff算法被摧毁和重建.赋予它一个持久的key保证这个component可达.详见 [这里](/react/docs/multiple-components.html#dynamic-children).
- `ref`: 见 [这里](/react/docs/more-about-refs.html).
- `dangerouslySetInnerHTML`: 提供了直接插入raw HTML的能力,主要是为了与操纵DOM字符串的库协作.详见 [这里](/react/tips/dangerously-set-inner-html.html).
update zh-docs (v0.14.3+) 9 years ago			`---`
			`id: special-non-dom-attributes-zh-CN`
			`title: 特殊的 Non-DOM Attributes`
Upgrade to Jekyll 3 Full list of changes is at https://jekyllrb.com/docs/upgrading/2-to-3/. The tl;dr of it is: - Relative permalinks were removed, so all the files in the `docs` subdirectory need their permalink to be prefixed with `docs/` - `post` and `page` types were renamed to `posts` and `pages` respectively - `jekyll-paginate`, `pygments` and `redcarpet` are all now optional, so I needed to explicitly add it to the Gemfile. Jekyll now uses `rouge` rather than `pygments` for syntax highlighting, but rouge does not support highlighting individual lines (`hl_lines`) so we need to continue using Pygments. - Layout metadata (eg. `sectionid`) is now on a `layout` variable rather than `page` Tested the following pages and confirmed that they all work: - "Docs" link (getting started page): http://127.0.0.1:4000/react/docs/getting-started.html - Downloads: http://127.0.0.1:4000/react/downloads.html - Tutorial: http://127.0.0.1:4000/react/docs/tutorial.html - A few pages under the "docs" subdirectory, to confirm they're working properly: - http://127.0.0.1:4000/react/docs/addons.html - http://127.0.0.1:4000/react/docs/why-react.html - http://127.0.0.1:4000/react/docs/create-fragment.html - A few tips: - http://127.0.0.1:4000/react/tips/false-in-jsx.html - http://127.0.0.1:4000/react/tips/style-props-value-px.html - Non-English versions of the page: - http://127.0.0.1:4000/react/docs/getting-started-it-IT.html - http://127.0.0.1:4000/react/docs/getting-started-ja-JP.html 9 years ago			`permalink: docs/special-non-dom-attributes-zh-CN.html`
update zh-docs (v0.14.3+) 9 years ago			`prev: dom-differences-zh-CN.html`
			`next: reconciliation-zh-CN.html`
			`---`

			`和 [DOM 的不同之处](/react/docs/dom-differences-zh-CN.html)相比, React 提供了一些不存在于DOM的 attributes .`

			- `key`: 一个可选的.独特的标识.当你的组件穿梭于 `render` 的pass,它也许会因为diff算法被摧毁和重建.赋予它一个持久的key保证这个component可达.详见 [这里](/react/docs/multiple-components.html#dynamic-children).
			- `ref`: 见 [这里](/react/docs/more-about-refs.html).
			- `dangerouslySetInnerHTML`: 提供了直接插入raw HTML的能力,主要是为了与操纵DOM字符串的库协作.详见 [这里](/react/tips/dangerously-set-inner-html.html).