93 lines
4.8 KiB
Markdown
93 lines
4.8 KiB
Markdown
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---
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id: 587d7fa8367417b2b2512bca
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title: Change the Presentation of a Bar Chart
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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: 更改条形图的演示文稿
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---
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## Description
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<section id="description">最后一个挑战创建了一个条形图，但有几个格式更改可以改善它：1）在每个条之间添加空格以在视觉上分隔它们，这是通过为<code>bar</code>类添加边距来完成的2）增加条形的高度可以更好地显示值的差异，这可以通过将值乘以数字来缩放高度来完成</section>
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## Instructions
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<section id="instructions">首先，在<code>style</code>标记的<code>bar</code>类中添加2px的<code>margin</code> 。接下来，更改<code>style()</code>方法中的回调函数，使其返回原始数据值的10倍（加上“px”）。 <strong>注意</strong> <br>将每个数据点乘以<em>相同的</em>常数只会改变比例。它就像放大一样，并没有改变底层数据的含义。 </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: 第一个<code>div</code>的<code>height</code>应为120像素， <code>margin</code>为2像素。
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testString: 'assert($("div").eq(0).css("height") == "120px" && $("div").eq(0).css("margin-right") == "2px", "The first <code>div</code> should have a <code>height</code> of 120 pixels and a <code>margin</code> of 2 pixels.");'
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- text: 第二个<code>div</code>的<code>height</code>应为310像素， <code>margin</code>为2像素。
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testString: 'assert($("div").eq(1).css("height") == "310px" && $("div").eq(1).css("margin-right") == "2px", "The second <code>div</code> should have a <code>height</code> of 310 pixels and a <code>margin</code> of 2 pixels.");'
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- text: 第三个<code>div</code>的<code>height</code>应为220像素， <code>margin</code>为2像素。
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testString: 'assert($("div").eq(2).css("height") == "220px" && $("div").eq(2).css("margin-right") == "2px", "The third <code>div</code> should have a <code>height</code> of 220 pixels and a <code>margin</code> of 2 pixels.");'
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- text: 第四个<code>div</code>的<code>height</code>应为170像素， <code>margin</code>为2像素。
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testString: 'assert($("div").eq(3).css("height") == "170px" && $("div").eq(3).css("margin-right") == "2px", "The fourth <code>div</code> should have a <code>height</code> of 170 pixels and a <code>margin</code> of 2 pixels.");'
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- text: 第五个<code>div</code>的<code>height</code>应为250像素， <code>margin</code>为2像素。
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testString: 'assert($("div").eq(4).css("height") == "250px" && $("div").eq(4).css("margin-right") == "2px", "The fifth <code>div</code> should have a <code>height</code> of 250 pixels and a <code>margin</code> of 2 pixels.");'
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- text: 第六个<code>div</code>的<code>height</code>应为180像素， <code>margin</code>为2像素。
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testString: 'assert($("div").eq(5).css("height") == "180px" && $("div").eq(5).css("margin-right") == "2px", "The sixth <code>div</code> should have a <code>height</code> of 180 pixels and a <code>margin</code> of 2 pixels.");'
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- text: 第七个<code>div</code>的<code>height</code>应为290像素， <code>margin</code>为2像素。
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testString: 'assert($("div").eq(6).css("height") == "290px" && $("div").eq(6).css("margin-right") == "2px", "The seventh <code>div</code> should have a <code>height</code> of 290 pixels and a <code>margin</code> of 2 pixels.");'
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- text: 第八个<code>div</code>的<code>height</code>应为140像素， <code>margin</code>为2像素。
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testString: 'assert($("div").eq(7).css("height") == "140px" && $("div").eq(7).css("margin-right") == "2px", "The eighth <code>div</code> should have a <code>height</code> of 140 pixels and a <code>margin</code> of 2 pixels.");'
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- text: 第九个<code>div</code>的<code>height</code>应为90像素， <code>margin</code>为2像素。
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testString: 'assert($("div").eq(8).css("height") == "90px" && $("div").eq(8).css("margin-right") == "2px", "The ninth <code>div</code> should have a <code>height</code> of 90 pixels and a <code>margin</code> of 2 pixels.");'
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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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/* Add your code below this line */
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/* Add your code above this line */
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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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.attr("class", "bar")
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// Add your code below this line
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.style("height", (d) => (d + "px"))
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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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