2018-10-10 22:03:03 +00:00
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---
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id: 587d7fa7367417b2b2512bc8
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title: Add Classes with D3
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challengeType: 6
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videoUrl: ''
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localeTitle: 使用D3添加类
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---
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## Description
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<section id="description">即使对于较小的应用程序，在HTML元素上使用大量内联样式也很难管理。使用CSS规则将类添加到元素和样式一次更容易。 D3具有<code>attr()</code>方法，可以向元素添加任何HTML属性，包括类名。 <code>attr()</code>方法的工作方式与<code>style()</code>工作方式相同。它采用逗号分隔值，并可以使用回调函数。这是一个向选择中添加“容器”类的示例： <code>selection.attr("class", "container");</code> </section>
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## Instructions
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<section id="instructions">将<code>attr()</code>方法添加到编辑器中的代码中，并在<code>div</code>元素上添加一个<code>bar</code>类。 </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: 你的<code>div</code>元素应该有一类<code>bar</code> 。
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2020-02-17 16:40:55 +00:00
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testString: assert($('div').attr('class') == "bar");
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2018-10-10 22:03:03 +00:00
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- text: 您的代码应使用<code>attr()</code>方法。
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2020-02-17 16:40:55 +00:00
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testString: assert(code.match(/\.attr/g));
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2018-10-10 22:03:03 +00:00
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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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<style>
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.bar {
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width: 25px;
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height: 100px;
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display: inline-block;
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background-color: blue;
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}
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</style>
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<body>
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<script>
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const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
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d3.select("body").selectAll("div")
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.data(dataset)
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.enter()
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.append("div")
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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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