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+---
+title: CanvasRenderingContext2D.direction
+slug: Web/API/CanvasRenderingContext2D/direction
+tags:
+  - Canvas
+  - CanvasRenderingContext2D
+translation_of: Web/API/CanvasRenderingContext2D/direction
+---
+<div>{{APIRef}} {{SeeCompatTable}}</div>
+
+<p><code><strong>CanvasRenderingContext2D</strong></code><strong><code>.direction</code></strong> 是Canvas 2D API 用来在绘制文本时，描述当前文本方向的属性。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><var><em>ctx</em>.direction = "ltr" || "rtl" || "inherit";</var>
+</pre>
+
+<h3 id="选项">选项</h3>
+
+<p>有效值:</p>
+
+<dl>
+ <dt>ltr</dt>
+ <dd>文本方向从左向右。</dd>
+ <dt>rtl</dt>
+ <dd>文本方向从右向左。</dd>
+ <dt>inherit</dt>
+ <dd>根据情况继承 {{HTMLElement("canvas")}} 元素或者 {{domxref("Document")}} 。</dd>
+</dl>
+
+<p>默认值是<code>inherit。</code></p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="Using_the_direction_property" name="Using_the_direction_property">使用<code>direction</code> 属性</h3>
+
+<p>这是一段简单的代码片段，对文本设置不同的direction数值。</p>
+
+<h4 id="HTML">HTML</h4>
+
+<pre class="brush: html">&lt;canvas id="canvas"&gt;&lt;/canvas&gt;</pre>
+
+<h4 id="JavaScript">JavaScript</h4>
+
+<pre class="brush: js">var canvas = document.getElementById('canvas');
+var ctx = canvas.getContext('2d');
+
+ctx.font = '48px serif';
+ctx.fillText('Hi!', 150, 50);
+ctx.direction = 'rtl';
+ctx.fillText('Hi!', 150, 130);</pre>
+
+
+
+<div class="hidden">
+<h6 id="Playable_code" name="Playable_code">Playable code</h6>
+
+<pre class="brush: html">&lt;canvas id="canvas" width="550" height="500"&gt;&lt;/canvas&gt;
+</pre>
+
+<pre class="brush: js">var canvas = document.getElementById('canvas');
+var ctx = canvas.getContext('2d');
+
+ctx.font = '48px serif';
+ctx.fillText('Hi!', 150, 50);
+ctx.direction = 'rtl';
+ctx.fillText('Hi!', 150, 130);</pre>
+</div>
+
+<h4 id="结果">结果</h4>
+
+<p>{{ EmbedLiveSample('Playable_code', 700, 180) }}</p>
+
+<h2 id="规范描述">规范描述</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML WHATWG', "scripting.html#dom-context-2d-direction", "CanvasRenderingContext2D.direction")}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div class="hidden">
+<p>此页面上的兼容性表是根据结构化数据生成的。 如果您想提供数据，请查看<a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a>并向我们发送请求请求。</p>
+</div>
+
+<p>{{Compat("api.CanvasRenderingContext2D.direction")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>接口定义， {{domxref("CanvasRenderingContext2D")}}.</li>
+</ul>