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+---
+title: Notification.dir
+slug: Web/API/notification/dir
+translation_of: Web/API/Notification/dir
+---
+<p>{{APIRef("Web Notifications")}}</p>
+
+<p>{{domxref("Notification")}} 的`dir`是一个只读属性，它表示Notification中显示的文本方向 会{{domxref("Notification.Notification","Notification()")}} 构造函数里制定的`dir` 属性的值来设定。</p>
+
+<p>{{AvailableInWorkers}}</p>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="eval">var <em>direction</em> = Notification.dir;
+</pre>
+
+<h3 id="Return_Value" name="Return_Value">值</h3>
+
+<p>一个表示文本方向的{{domxref("DOMString")}}变量。 可能的取值为:</p>
+
+<ul>
+ <li><code>auto</code>: 继承浏览器的语言设置里制定的方向 (默认)</li>
+ <li><code>ltr</code>: 从左到右</li>
+ <li><code>rtl</code> : 从右到左</li>
+</ul>
+
+<div class="note">
+<p><strong>提示</strong>:似乎大多数浏览器都忽略了明确的LTR 和RTL 设置，要按照与浏览器的通用设置来操作。</p>
+</div>
+
+<h2 id="例子">例子</h2>
+
+<p>The following snippet fires a notification; a simple <code>options</code> object is created, then the notification is fired using the <code>Notification()</code> constructor.</p>
+
+<pre class="brush: js">var options = {
+  body: '你去过新疆吗?',
+  dir: 'rtl'
+}
+
+var n = new Notification('测试通知',options);
+
+n.dir // 应该返回 'rtl'
+</pre>
+
+<h2 id="规则">规则</h2>
+
+<table>
+ <tbody>
+  <tr>
+   <th scope="col">规则</th>
+   <th scope="col">状态</th>
+   <th scope="col">注释</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('Web Notifications','#dom-notification-dir','dir')}}</td>
+   <td>{{Spec2('Web Notifications')}}</td>
+   <td>Living standard</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p>{{ CompatibilityTable() }}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Edge</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>基础支持</td>
+   <td>5 {{ property_prefix("webkit") }} (看提示)<br>
+    22</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>4.0 {{ property_prefix("moz") }} (看提示)<br>
+    22</td>
+   <td>{{ CompatNo() }}</td>
+   <td>25</td>
+   <td>6 (看提示)</td>
+  </tr>
+  <tr>
+   <td>Available in workers</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatGeckoDesktop("41.0")}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Android Webview</th>
+   <th>Edge</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>Firefox OS</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+   <th>Chrome for Android</th>
+  </tr>
+  <tr>
+   <td>基础支持</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>
+    <p>{{CompatVersionUnknown}}</p>
+   </td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>4.0 {{ property_prefix("moz") }} (看注释)<br>
+    22</td>
+   <td>1.0.1 {{ property_prefix("moz") }} (看注释)<br>
+    1.2</td>
+   <td>{{ CompatNo() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatNo() }}</td>
+   <td>
+    <p>{{CompatVersionUnknown}}</p>
+   </td>
+  </tr>
+  <tr>
+   <td>能在Worker里调用</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatGeckoMobile(41.0)}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h3 id="Firefox_OS_提示">Firefox OS 提示</h3>
+
+<p>{{Page("/en-US/docs/Web/API/Notifications_API", "Firefox OS notes")}}</p>
+
+<h3 id="Chrome_提示">Chrome 提示</h3>
+
+<p>{{Page("/en-US/docs/Web/API/Notifications_API", "Chrome notes")}}</p>
+
+<h3 id="Safari_提示">Safari 提示</h3>
+
+<p>{{Page("/en-US/docs/Web/API/Notifications_API", "Safari notes")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/API/Notifications_API/Using_the_Notifications_API">Using the Notifications API</a></li>
+</ul>