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---
id: special-non-dom-attributes-it-IT
title: Attributi Speciali Non-DOM
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
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---
Oltre alle [Differenze del DOM](/react/docs/dom-differences.html), React offre alcuni attributi che semplicemente non esistono nel DOM.
- `key`: un identificatore univoco opzionale. Quando il tuo componente viene riordinato durante i passaggi di `render`, potrebbe essere distrutto e ricreato in base all'algoritmo di calcolo delle differenze. Assegnargli una chiave che persiste assicura che il componente venga preservato. Scopri maggiori dettagli [qui](/react/docs/multiple-components.html#dynamic-children).
- `ref`: leggi [qui](/react/docs/more-about-refs.html).
- `dangerouslySetInnerHTML`: Offre l'abilità di inserire HTML grezzo, principalmente per cooperare con librerie di manipolazione di stringhe DOM. Scopri maggiori dettagli [qui](/react/tips/dangerously-set-inner-html.html).