2018-10-10 22:03:03 +00:00
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---
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id: 587d7787367417b2b2512aa1
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2021-01-08 19:20:48 +00:00
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title: 使用 header 元素来让屏幕阅读器更容易进行导航
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2018-10-10 22:03:03 +00:00
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challengeType: 0
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2020-02-11 09:06:41 +00:00
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videoUrl: 'https://scrimba.com/c/cB76vtv'
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forumTopicId: 301023
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2021-01-13 02:31:00 +00:00
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dashedName: make-screen-reader-navigation-easier-with-the-header-landmark
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2018-10-10 22:03:03 +00:00
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---
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2020-12-16 07:37:30 +00:00
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# --description--
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2018-10-10 22:03:03 +00:00
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2021-02-06 04:42:36 +00:00
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`header` 也是一个具有语义化的、可以提升页面可访问性的 HTML5 标签。 它可以为父级标签呈现简介信息或者导航链接，适用于那些在多个页面顶部重复出现的内容。
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2020-12-16 07:37:30 +00:00
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2021-01-08 19:20:48 +00:00
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与 `main` 类似，`header` 的语义化特性也可以让辅助工具快速定位到它的内容。
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2020-12-16 07:37:30 +00:00
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2021-08-25 16:12:11 +00:00
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**注意：** `header` 应当在 HTML 文档的 `body` 标签内使用。 它与包含页面标题、元信息的 `head` 标签不同。
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2020-12-16 07:37:30 +00:00
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# --instructions--
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2018-10-10 22:03:03 +00:00
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2021-02-06 04:42:36 +00:00
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Camper Cat 正在创作一些训练忍者的精彩文章，并打算为这些文章创建一个新的页面。 请把包含 `h1` 的 `div` 标签替换为 `header` 标签。
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2020-12-16 07:37:30 +00:00
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# --hints--
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2021-01-08 19:20:48 +00:00
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应该存在一个 `header` 标签。
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2020-12-16 07:37:30 +00:00
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```js
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assert($('header').length == 1);
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2018-10-10 22:03:03 +00:00
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```
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2021-01-08 19:20:48 +00:00
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`header` 标签中应包含 `h1`。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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```js
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assert($('header').children('h1').length == 1);
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```
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2018-10-10 22:03:03 +00:00
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2021-01-08 19:20:48 +00:00
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不应存在 `div` 标签。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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```js
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assert($('div').length == 0);
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```
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2018-10-10 22:03:03 +00:00
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2021-01-08 19:20:48 +00:00
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确保 `header` 标签是闭合的。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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```js
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assert(
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code.match(/<\/header>/g) &&
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code.match(/<\/header>/g).length === code.match(/<header>/g).length
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);
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2018-10-10 22:03:03 +00:00
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```
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2020-02-11 09:06:41 +00:00
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2021-01-13 02:31:00 +00:00
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# --seed--
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## --seed-contents--
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```html
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<body>
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<div>
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<h1>Training with Camper Cat</h1>
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</div>
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<main>
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<section id="stealth">
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<h2>Stealth & Agility Training</h2>
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<article><h3>Climb foliage quickly using a minimum spanning tree approach</h3></article>
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<article><h3>No training is NP-complete without parkour</h3></article>
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</section>
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<section id="combat">
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<h2>Combat Training</h2>
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<article><h3>Dispatch multiple enemies with multithreaded tactics</h3></article>
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<article><h3>Goodbye world: 5 proven ways to knock out an opponent</h3></article>
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</section>
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<section id="weapons">
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<h2>Weapons Training</h2>
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<article><h3>Swords: the best tool to literally divide and conquer</h3></article>
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<article><h3>Breadth-first or depth-first in multi-weapon training?</h3></article>
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</section>
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</main>
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</body>
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```
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2020-12-16 07:37:30 +00:00
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# --solutions--
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2021-01-13 02:31:00 +00:00
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```html
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<body>
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<header>
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<h1>Training with Camper Cat</h1>
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</header>
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<main>
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<section id="stealth">
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<h2>Stealth & Agility Training</h2>
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<article><h3>Climb foliage quickly using a minimum spanning tree approach</h3></article>
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<article><h3>No training is NP-complete without parkour</h3></article>
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</section>
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<section id="combat">
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<h2>Combat Training</h2>
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<article><h3>Dispatch multiple enemies with multithreaded tactics</h3></article>
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<article><h3>Goodbye world: 5 proven ways to knock out an opponent</h3></article>
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</section>
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<section id="weapons">
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<h2>Weapons Training</h2>
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<article><h3>Swords: the best tool to literally divide and conquer</h3></article>
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<article><h3>Breadth-first or depth-first in multi-weapon training?</h3></article>
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</section>
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</main>
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</body>
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```
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