From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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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><code>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。</code></dd>
+ <dt><code>alternate</code></dt>
+ <dd><code>动画交替反向运行，反向运行时，动画按步后退，同时，</code><span style="line-height: 1.5;">带时间功能的函数也反向，比如，ease-in 在反向时成为ease-out。计数取决于开始时是奇数迭代还是偶数迭代</span></dd>
+ <dt><code>reverse</code></dt>
+ <dd><font face="Courier New, Andale Mono, monospace"><span style="line-height: normal;">反向运行动画，每周期结束动画由尾到头运行。</span></font></dd>
+ <dt><code>alternate-reverse</code></dt>
+ <dd><code>反向交替， 反向开始交替</code></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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