69 lines
2.0 KiB
Markdown
69 lines
2.0 KiB
Markdown
---
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id: 587d7fa6367417b2b2512bc3
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title: Select a Group of Elements with D3
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required:
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- src: 'https://cdnjs.cloudflare.com/ajax/libs/d3/4.3.0/d3.min.js'
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challengeType: 6
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videoUrl: ''
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localeTitle: 使用D3选择一组元素
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---
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## Description
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<section id="description"> D3还有<code>selectAll()</code>方法来选择一组元素。它返回文档中与输入字符串匹配的所有项目的HTML节点数组。这是一个选择文档中所有锚标记的示例： <code>const anchors = d3.selectAll("a");</code>与<code>select()</code>方法一样， <code>selectAll()</code>支持方法链接，您可以将其与其他方法一起使用。 </section>
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## Instructions
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<section id="instructions">选择文档中的所有<code>li</code>标签，并通过链接<code>.text()</code>方法将其文本更改为“list item”。 </section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: 页面上应该有3个<code>li</code>元素，每个元素中的文本应该是“list item”。大写和间距应完全匹配。
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testString: 'assert($("li").text().match(/list item/g).length == 3, "There should be 3 <code>li</code> elements on the page, and the text in each one should say "list item". Capitalization and spacing should match exactly.");'
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- text: 您的代码应该访问<code>d3</code>对象。
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testString: 'assert(code.match(/d3/g), "Your code should access the <code>d3</code> object.");'
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- text: 您的代码应该使用<code>selectAll</code>方法。
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testString: 'assert(code.match(/\.selectAll/g), "Your code should use the <code>selectAll</code> method.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='html-seed'>
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```html
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<body>
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<ul>
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<li>Example</li>
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<li>Example</li>
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<li>Example</li>
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</ul>
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<script>
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// Add your code below this line
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// Add your code above this line
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</script>
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</body>
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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