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: rotateY()
+slug: Web/CSS/transform-function/rotateY()
+translation_of: Web/CSS/transform-function/rotateY()
+---
+<div>{{CSSRef}}</div>
+
+<p><strong><code>rotateY()</code></strong>  函数定义了一个转换，它可以让一个元素围绕纵坐标(垂直轴)旋转，而不会对其进行变形。它的结果是一个{{cssxref("&lt;transform-function&gt;")}} 数据类型。</p>
+
+<div>{{EmbedInteractiveExample("pages/css/function-rotateY.html")}}</div>
+
+
+
+<p>旋转轴围绕原点旋转，而这个原点通过{{cssxref("transform-origin")}} 属性来定义。</p>
+
+<div class="note">
+<p><strong>注意:</strong> <code>rotateY(a)</code> 相当于 <code><a href="/en-US/docs/Web/CSS/transform-function/rotate3d">rotate3d</a>(0, 1, 0, a)</code>.</p>
+</div>
+
+<div class="note"><strong>注意:</strong> 与二维平面上的旋转不同，三维旋转的组合顺序通常是不可交换的。换句话说，三维旋转的应用顺序，将会影响最终结果。</div>
+
+<h2 id="语法">语法</h2>
+
+<p><strong><code>rotateY() </code></strong>引起的旋转量由{{cssxref("&lt;angle&gt;")}}指定。如果为正，则顺时针方向移动；如果为负，则逆时针方向移动。</p>
+
+<pre class="syntaxbox">rotateY(<em>a</em>)
+</pre>
+
+<h3 id="参数值">参数值</h3>
+
+<dl>
+ <dt><code>a</code></dt>
+ <dd><code>a</code> 是一个{{cssxref("&lt;angle&gt;")}} ，表示旋转的角度。正数角度表示顺时针旋转，负数则表示逆时针旋转。</dd>
+</dl>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">笛卡儿坐标 ℝ<sup>2</sup></th>
+   <th scope="col">齐次坐标 ℝℙ<sup>2</sup></th>
+   <th scope="col">笛卡儿坐标 ℝ<sup>3</sup></th>
+   <th scope="col">齐次坐标 ℝℙ<sup>3</sup></th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td colspan="2">This transformation applies to the 3D space and can't be represented on the plane.</td>
+   <td colspan="1"><math> <mfenced><mtable><mtr><mtd>cos(a)</mtd><mtd>0</mtd><mtd>sin(a)</mtd></mtr><mtr><mtd>0</mtd><mtd>1</mtd><mtd>0</mtd></mtr><mtr><mtd>-sin(a)</mtd><mtd>0</mtd><mtd>cos(a)</mtd></mtr></mtable> </mfenced> </math></td>
+   <td colspan="1"><math><mfenced><mtable><mtr><mtd>cos(a)</mtd><mtd>0</mtd><mtd>sin(a)</mtd><mtd>0</mtd></mtr><mtr><mtd>0</mtd><mtd>1</mtd><mtd>0</mtd><mtd>0</mtd></mtr><mtr><mtd>-sin(a)</mtd><mtd>0</mtd><mtd>cos(a)</mtd><mtd>0</mtd></mtr><mtr><mtd>0</mtd><mtd>0</mtd><mtd>0</mtd><mtd>1</mtd></mtr></mtable> </mfenced> </math></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="HTML">HTML</h3>
+
+<pre class="brush: html">&lt;div&gt;Normal&lt;/div&gt;
+&lt;div class="rotated"&gt;Rotated&lt;/div&gt;</pre>
+
+<h3 id="CSS">CSS</h3>
+
+<pre class="brush: css">div {
+  width: 80px;
+  height: 80px;
+  background-color: skyblue;
+}
+
+.rotated {
+  transform: rotateY(60deg);
+  background-color: pink;
+}
+</pre>
+
+<h3 id="结果">结果</h3>
+
+<p>{{EmbedLiveSample("示例", "auto", 180)}}</p>
+
+<h2 id="规范">规范</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("CSS Transforms 2", "#funcdef-rotatey", "rotateY()")}}</td>
+   <td>{{Spec2("CSS Transforms 2")}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容">浏览器兼容</h2>
+
+<p>有关兼容性信息，请参阅 <code><a href="/en-US/docs/Web/CSS/transform-function#Browser_compatibility">&lt;transform-function&gt;</a></code> 的数据类型。</p>
+
+<h2 id="另请参阅">另请参阅</h2>
+
+<ul>
+ <li>{{cssxref("transform")}}</li>
+ <li>{{cssxref("&lt;transform-function&gt;")}}</li>
+</ul>
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