88 lines
		
	
	
		
			3.0 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
		
		
			
		
	
	
			88 lines
		
	
	
		
			3.0 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
|   | --- | |||
|  | id: 587d78a7367417b2b2512ae1 | |||
|  | title: Create Movement Using CSS Animation | |||
|  | challengeType: 0 | |||
|  | videoUrl: '' | |||
|  | localeTitle: 使用CSS动画创建运动 | |||
|  | --- | |||
|  | 
 | |||
|  | ## Description
 | |||
|  | <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> | |||
|  | 
 | |||
|  | ## Instructions
 | |||
|  | <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> | |||
|  | 
 | |||
|  | ## Tests
 | |||
|  | <section id='tests'> | |||
|  | 
 | |||
|  | ```yml | |||
|  | tests: | |||
|  |   - text: <code>0%</code>的<code>@keyframes</code>规则应使用0px的<code>left</code>偏移量。 | |||
|  |     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.");' | |||
|  |   - text: <code>50%</code>的<code>@keyframes</code>规则应该使用25px的<code>left</code>偏移量。 | |||
|  |     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.");' | |||
|  |   - text: <code>100%</code>的<code>@keyframes</code>规则应使用-25px的<code>left</code>偏移量。 | |||
|  |     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.");' | |||
|  | 
 | |||
|  | ``` | |||
|  | 
 | |||
|  | </section> | |||
|  | 
 | |||
|  | ## Challenge Seed
 | |||
|  | <section id='challengeSeed'> | |||
|  | 
 | |||
|  | <div id='html-seed'> | |||
|  | 
 | |||
|  | ```html | |||
|  | <style> | |||
|  |   div { | |||
|  |     height: 40px; | |||
|  |     width: 70%; | |||
|  |     background: black; | |||
|  |     margin: 50px auto; | |||
|  |     border-radius: 5px; | |||
|  |     position: relative; | |||
|  |   } | |||
|  | 
 | |||
|  | #rect {
 | |||
|  |   animation-name: rainbow; | |||
|  |   animation-duration: 4s; | |||
|  | } | |||
|  | 
 | |||
|  | @keyframes rainbow { | |||
|  |   0% { | |||
|  |     background-color: blue; | |||
|  |     top: 0px; | |||
|  | 
 | |||
|  |   } | |||
|  |   50% { | |||
|  |     background-color: green; | |||
|  |     top: 50px; | |||
|  | 
 | |||
|  |   } | |||
|  |   100% { | |||
|  |     background-color: yellow; | |||
|  |     top: 0px; | |||
|  | 
 | |||
|  |   } | |||
|  | } | |||
|  | </style> | |||
|  | 
 | |||
|  | <div id="rect"></div> | |||
|  | 
 | |||
|  | ``` | |||
|  | 
 | |||
|  | </div> | |||
|  | 
 | |||
|  | 
 | |||
|  | 
 | |||
|  | </section> | |||
|  | 
 | |||
|  | ## Solution
 | |||
|  | <section id='solution'> | |||
|  | 
 | |||
|  | ```js | |||
|  | // solution required | |||
|  | ``` | |||
|  | </section> |