88 lines
		
	
	
		
			3.0 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
		
		
			
		
	
	
			88 lines
		
	
	
		
			3.0 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
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								---
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								id: 587d78a7367417b2b2512ae1
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								title: Create Movement Using CSS Animation
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								challengeType: 0
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								videoUrl: ''
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								localeTitle: 使用CSS动画创建运动
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								---
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								## Description
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								<section id="description">当元素具有指定<code>position</code> (例如<code>fixed</code>或<code>relative</code> ,可以在动画规则中使用<code>right</code> , <code>left</code> , <code>top</code>和<code>bottom</code>的CSS偏移属性来创建移动。如下面的示例所示,您可以通过将<code>50%</code>关键帧的<code>top</code>属性设置为50px向下然后向上推动项目,但将第一个( <code>0%</code> )和最后一个( <code>100%</code> )关键帧设置为0px。 <blockquote> @keyframes rainbow { <br> 0%{ <br>背景颜色:蓝色; <br>顶部:0px; <br> } <br> 50%{ <br>背景颜色:绿色; <br>上:50px; <br> } <br> 100%{ <br>背景颜色:黄色; <br>顶部:0px; <br> } <br> } </blockquote></section>
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								## Instructions
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								<section id="instructions">为<code>div</code>动画添加水平运动。使用<code>left</code>偏移属性,添加到<code>@keyframes</code>规则,因此彩虹从<code>0%</code> 0像素开始,在<code>50%</code>移动到25像素,在<code>100%</code>以-25像素结束。不要替换编辑器中的<code>top</code>属性 - 动画应该具有垂直和水平运动。 </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: <code>0%</code>的<code>@keyframes</code>规则应使用0px的<code>left</code>偏移量。
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								    testString: 'assert(code.match(/0%\s*?{\s*?background-color:\s*?blue;\s*?top:\s*?0(px)?;\s*?left:\s*?0(px)?;\s*?}/gi), "The <code>@keyframes</code> rule for <code>0%</code> should use the <code>left</code> offset of 0px.");'
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								  - text: <code>50%</code>的<code>@keyframes</code>规则应该使用25px的<code>left</code>偏移量。
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								    testString: 'assert(code.match(/50%\s*?{\s*?background-color:\s*?green;\s*?top:\s*?50px;\s*?left:\s*?25px;\s*?}/gi), "The <code>@keyframes</code> rule for <code>50%</code> should use the <code>left</code> offset of 25px.");'
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								  - text: <code>100%</code>的<code>@keyframes</code>规则应使用-25px的<code>left</code>偏移量。
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								    testString: 'assert(code.match(/100%\s*?{\s*?background-color:\s*?yellow;\s*?top:\s*?0(px)?;\s*?left:\s*?-25px;\s*?}/gi), "The <code>@keyframes</code> rule for <code>100%</code> should use the <code>left</code> offset of -25px.");'
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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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								  div {
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								    height: 40px;
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								    width: 70%;
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								    background: black;
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								    margin: 50px auto;
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								    border-radius: 5px;
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								    position: relative;
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								  }
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								#rect {
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								  animation-name: rainbow;
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								  animation-duration: 4s;
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								}
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								@keyframes rainbow {
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								  0% {
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								    background-color: blue;
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								    top: 0px;
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								  }
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								  50% {
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								    background-color: green;
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								    top: 50px;
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								  }
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								  100% {
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								    background-color: yellow;
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								    top: 0px;
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								  }
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								}
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								</style>
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								<div id="rect"></div>
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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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