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---
title: animation-direction
slug: Web/CSS/animation-direction
tags:
- CSS
- CSS Animations
- CSS Property
- Experimental
- Reference
translation_of: Web/CSS/animation-direction
---
<div>{{CSSRef}}</div>
<div>{{SeeCompatTable}}</div>
<h2 id="概述">概述</h2>
<p><code>animation-direction</code> CSS 属性指示动画是否反向播放，它通常在简写属性{{cssxref("animation")}}中设定</p>
<p>{{cssinfo}}</p>
<h2 id="语法">语法</h2>
<pre class="twopartsyntaxbox"><a href="/en-US/docs/CSS/Value_definition_syntax" title="CSS/Value_definition_syntax">Formal syntax</a>: {{csssyntax("animation-direction")}}
</pre>
<pre>animation-direction: normal
animation-direction: reverse
animation-direction: alternate
animation-direction: alternate-reverse
animation-direction: normal, reverse
animation-direction: alternate, reverse, normal
</pre>
<h3 id="值">值</h3>
<dl>
<dt><code>normal</code></dt>
<dd>每个循环内动画向前循环，换言之，每个动画循环结束，动画重置到起点重新开始，这是默认属性。</dd>
<dt><code>alternate</code></dt>
<dd>动画交替反向运行，反向运行时，动画按步后退，同时，带时间功能的函数也反向，比如，<code>ease-in</code> 在反向时成为 <code>ease-out</code>。计数取决于开始时是奇数迭代还是偶数迭代</dd>
<dt><code>reverse</code></dt>
<dd>反向运行动画，每周期结束动画由尾到头运行。</dd>
<dt><code>alternate-reverse</code></dt>
<dd>反向交替， 反向开始交替</dd>
<dd>动画第一次运行时是反向的，然后下一次是正向，后面依次循环。决定奇数次或偶数次的计数从1开始。</dd>
</dl>
<h2 id="例子">例子</h2>
<p>See <a href="/en-US/docs/CSS/CSS_animations" title="CSS/CSS_animations">CSS animations</a> for examples.</p>
<h2 id="Specifications">Specifications</h2>
<table class="standard-table">
<thead>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
</thead>
<tbody>
<tr>
<td>{{SpecName('CSS3 Animations', '#animation-direction', 'animation-direction')}}</td>
<td>{{Spec2('CSS3 Animations')}}</td>
<td>For the two new values, see the <a href="http://lists.w3.org/Archives/Public/www-style/2011May/0090.html">W3C discussion</a>.</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<p>{{Compat("css.properties.animation-direction")}}</p>
<h2 id="更多">更多</h2>
<ul>
<li><a href="/en-US/docs/CSS/Tutorials/Using_CSS_animations" title="Tutorial about CSS animations">Using CSS animations</a></li>
<li>{{domxref("AnimationEvent", "AnimationEvent")}}</li>
</ul>
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