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• 句法
• 形式定义
• 形式句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

animation-direction CSS property sets whether an animation should play forward, backward, or alternate back and forth between playing the sequence forward and backward.

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

It is often convenient to use the shorthand property animation to set all animation properties at once.

句法

/* Single animation */
animation-direction: normal;
animation-direction: reverse;
animation-direction: alternate;
animation-direction: alternate-reverse;
/* Multiple animations */
animation-direction: normal, reverse;
animation-direction: alternate, reverse, normal;
/* Global values */
animation-direction: inherit;
animation-direction: initial;
animation-direction: unset;
					

值

normal

The animation plays forwards each cycle. In other words, each time the animation cycles, the animation will reset to the beginning state and start over again. This is the default value.

reverse

The animation plays backwards each cycle. In other words, each time the animation cycles, the animation will reset to the end state and start over again. Animation steps are performed backwards, and timing functions are also reversed. For example, an ease-in timing function becomes ease-out .

alternate

The animation reverses direction each cycle, with the first iteration being played forwards . The count to determine if a cycle is even or odd starts at one.

alternate-reverse

The animation reverses direction each cycle, with the first iteration being played backwards . The count to determine if a cycle is even or odd starts at one.

注意 : When you specify multiple comma-separated values on an animation-* property, they will be assigned to the animations specified in the animation-name property in different ways depending on how many there are. For more information, see Setting multiple animation property values .

形式定义

初始值	normal
适用于	所有元素， ::before and ::after pseudo-elements
继承	no
计算值	如指定
动画类型	discrete

形式句法

<single-animation-direction>#
where 
<single-animation-direction> = normal | reverse | alternate | alternate-reverse
					

范例

The animation is  playing reversed

HTML

<div class="box"></div>
					

CSS

.box {
  background-color: rebeccapurple;
  border-radius: 10px;
  width: 100px;
  height: 100px;
  animation-name: rotate;
  animation-duration: 0.7s;
  animation-direction: reverse;
}
@keyframes rotate {
  0% {
    transform: rotate(0);
  }
  100% {
    transform: rotate(360deg);
  }
}
					

见 CSS animations 范例。

规范

规范	状态	注释
CSS 动画 The definition of 'animation-direction' in that specification.	工作草案	初始定义。

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
animation-direction	Chrome 完整支持 43	Edge 完整支持 12	Firefox 完整支持 16 完整支持 16 Prefixed Implemented with the vendor prefix: -webkit- 完整支持 Prefixed Implemented with the vendor prefix: -webkit- Disabled layout.css.prefixes.webkit preference (needs to be set to true ). To change preferences in Firefox, visit about:config. 完整支持 5 Prefixed Prefixed Implemented with the vendor prefix: -moz-	IE 完整支持 10	Opera 完整支持 30 完整支持 30 Prefixed Implemented with the vendor prefix: -webkit- 不支持 12.1 — 15 不支持 12 — 15 Prefixed Prefixed Implemented with the vendor prefix: -o-	Safari 完整支持 9	WebView Android 完整支持 43	Chrome Android 完整支持 43	Firefox Android 完整支持 16 完整支持 16 Prefixed Implemented with the vendor prefix: -webkit- 完整支持 Prefixed Implemented with the vendor prefix: -webkit- Disabled layout.css.prefixes.webkit preference (needs to be set to true ). To change preferences in Firefox, visit about:config. 完整支持 5 Prefixed Prefixed Implemented with the vendor prefix: -moz-	Opera Android 完整支持 30 完整支持 30 Prefixed Implemented with the vendor prefix: -webkit- 不支持 12.1 — 14 不支持 12 — 14 Prefixed Prefixed Implemented with the vendor prefix: -o-	Safari iOS 完整支持 9	Samsung Internet Android 完整支持 4.0
alternate-reverse	Chrome 完整支持 19	Edge 完整支持 12	Firefox 完整支持 16	IE 完整支持 10	Opera 完整支持 12.1	Safari 完整支持 6	WebView Android 完整支持 ≤37	Chrome Android 完整支持 25	Firefox Android 完整支持 16	Opera Android 完整支持 12.1	Safari iOS 完整支持 6	Samsung Internet Android 完整支持 1.5
reverse	Chrome 完整支持 19	Edge 完整支持 12	Firefox 完整支持 16	IE 完整支持 10	Opera 完整支持 12.1	Safari 完整支持 6	WebView Android 完整支持 ≤37	Chrome Android 完整支持 25	Firefox Android 完整支持 16	Opera Android 完整支持 12.1	Safari iOS 完整支持 6	Samsung Internet Android 完整支持 1.5

图例

完整支持

完整支持

用户必须明确启用此特征。

用户必须明确启用此特征。

要求使用供应商前缀或不同名称。

要求使用供应商前缀或不同名称。

另请参阅

• 使用 CSS 动画
• JavaScript AnimationEvent API

元数据

• 最后修改： Oct 15, 2020

相关话题

1. CSS
2. CSS 参考
3. CSS 动画
4. 指南

   1. CSS 动画提示和技巧
   2. 检测 CSS 动画支持
   3. 使用 CSS 动画
5. At-Rules

   1. @keyframes
6. 特性

   1. <custom-ident>
   2. animation
   3. animation-delay
   4. animation-direction
   5. animation-duration
   6. animation-fill-mode
   7. animation-iteration-count
   8. animation-name
   9. animation-play-state
   10. animation-timing-function