2018-10-10 22:03:03 +00:00
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---
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id: 587d7790367417b2b2512ab1
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2020-12-16 07:37:30 +00:00
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title: 使用 tabindex 指定多个元素的键盘焦点顺序
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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/cmzRRcb'
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forumTopicId: 301028
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2021-01-13 02:31:00 +00:00
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dashedName: use-tabindex-to-specify-the-order-of-keyboard-focus-for-several-elements
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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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2021-01-08 19:20:48 +00:00
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`tabindex` 属性还可以指定元素的 tab 键焦点顺序，将它的值设置为大于等于 1 的整数就可以实现这个功能。
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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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在使用键盘导航时，`tabindex` 属性值为 1 的元素会最先聚焦（选中）；之后，焦点将按照 `tabindex` 值（如：2、3 等）的顺序进行移动，最后回到默认（即 `tabindex` 值为 0）的元素上，如此循环。
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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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需要注意的是，使用这种方式设置 tab 键焦点顺序会覆盖默认顺序，其中默认顺序为标签在文档流中出现的顺序。这可能会让那些希望从页面顶部开始导航的用户感到困惑。使用 `tabindex` 在某些情况下是必要的，但在使用时要充分考虑到页面的可访问性。
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2020-12-16 07:37:30 +00:00
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2020-02-11 09:06:41 +00:00
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举个例子：
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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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`<div tabindex="1">I get keyboard focus, and I get it first!</div>`
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`<div tabindex="2">I get keyboard focus, and I get it second!</div>`
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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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# --instructions--
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2021-01-08 19:20:48 +00:00
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Camper Cat 在他的励志名言页面中有一个搜索区域，他打算使用 CSS 把这个区域定位在页面的右上角。Camper Cat 希望他的搜索（search）`input` 与提交（submit）`input` 表单控件是 tab 键焦点顺序的前两项。请为搜索（search）`input` 添加 `tabindex` 属性，其属性值为 1；为提交（submit）`input` 添加 `tabindex` 属性，其属性值为 2。
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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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搜索 `input` 标签应包含 `tabindex` 属性。
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2020-12-16 07:37:30 +00:00
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```js
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assert($('#search').attr('tabindex'));
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2018-10-10 22:03:03 +00:00
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```
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2021-01-08 19:20:48 +00:00
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提交 `input` 标签应包含 `tabindex` 属性。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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```js
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assert($('#submit').attr('tabindex'));
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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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搜索 `input` 标签的 `tabindex` 属性值应为 1。
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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($('#search').attr('tabindex') == '1');
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```
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2018-10-10 22:03:03 +00:00
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2021-01-08 19:20:48 +00:00
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提交 `input` 标签的 `tabindex` 属性值应为 2。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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```js
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assert($('#submit').attr('tabindex') == '2');
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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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<header>
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<h1>Even Deeper Thoughts with Master Camper Cat</h1>
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<nav>
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<ul>
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<li><a href="">Home</a></li>
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<li><a href="">Blog</a></li>
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<li><a href="">Training</a></li>
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</ul>
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</nav>
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</header>
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<form>
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<label for="search">Search:</label>
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<input type="search" name="search" id="search">
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<input type="submit" name="submit" value="Submit" id="submit">
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</form>
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<h2>Inspirational Quotes</h2>
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<blockquote>
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<p>“There's no Theory of Evolution, just a list of creatures I've allowed to live.”<br>
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- Chuck Norris</p>
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</blockquote>
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<blockquote>
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<p>“Wise men say forgiveness is divine, but never pay full price for late pizza.”<br>
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- TMNT</p>
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</blockquote>
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<footer>© 2018 Camper Cat</footer>
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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>Even Deeper Thoughts with Master Camper Cat</h1>
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<nav>
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<ul>
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<li><a href="">Home</a></li>
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<li><a href="">Blog</a></li>
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<li><a href="">Training</a></li>
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</ul>
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</nav>
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</header>
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<form>
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<label for="search">Search:</label>
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<input tabindex="1" type="search" name="search" id="search">
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<input tabindex="2" type="submit" name="submit" value="Submit" id="submit">
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</form>
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<h2>Inspirational Quotes</h2>
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<blockquote>
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<p>“There's no Theory of Evolution, just a list of creatures I've allowed to live.”<br>
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- Chuck Norris</p>
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</blockquote>
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<blockquote>
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<p>“Wise men say forgiveness is divine, but never pay full price for late pizza.”<br>
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- TMNT</p>
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</blockquote>
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<footer>© 2018 Camper Cat</footer>
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</body>
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```
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