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---
title: Navigator.mozHasPendingMessage()
slug: Archive/B2G_OS/API/Navigator/mozHasPendingMessage
translation_of: Archive/B2G_OS/API/Navigator/mozHasPendingMessage
---
<p></p><section class="Quick_links" id="Quick_Links"><ol><li><strong><a href="/zh-CN/docs/Web/API/Archive"><code>Archive</code></a></strong></li><li class="toggle"><details open><summary>Related pages for Firefox OS</summary><ol><li><a href="/zh-CN/docs/Web/API/MozAlarmsManager"><code>MozAlarmsManager</code></a></li><li><a href="/zh-CN/docs/Web/API/MozMobileNetworkInfo"><code>MozMobileNetworkInfo</code></a></li><li><a href="/zh-CN/docs/Web/API/MozWifiP2pGroupOwner"><code>MozWifiP2pGroupOwner</code></a></li></ol></details></li></ol></section><div class="warning">
<p style="text-align: center;">此 API 在 <a href="/zh-CN/docs/Mozilla/Firefox_OS">Firefox OS</a> 的<a href="/zh-CN/docs/Mozilla/Firefox_OS/Security/Application_security#App_Types">网页内容或高权限的应用程序</a>上可用。</p>
</div><p></p>
<h2 id="概要">概要</h2>
<p>该方法用来用于判定一个给定类型(type)是否存在未决消息（待处理的消息），返回类型为是(true)或非(false)。</p>
<p>当<a href="/zh-CN/docs/Web/API/Window/navigator/mozSetMessageHandler" title="此页面仍未被本地化, 期待您的翻译!"><code>navigator.mozSetMessageHandler()</code></a> 用于设定一种类型的句柄时，待处理的消息会以异步的方式的传输给应用。 </p>
<h2 id="语法">语法</h2>
<pre>navigator.mozHasPendingMessage(type);</pre>
<h3 id="参数">参数</h3>
<dl>
<dt><code>type</code></dt>
<dd>类型是字符串，用于表示一个应用注册的处理函数要处理的消息。要获得有效type的完整列表，请参考<a href="/zh-CN/docs/Web/API/Window/navigator/mozSetMessageHandler" title="此页面仍未被本地化, 期待您的翻译!"><code>navigator.mozSetMessageHandler()</code></a>.</dd>
</dl>
<h2 id="返回值">返回值</h2>
<p>布尔类型。</p>
<h2 id="规范">规范</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">规范</th>
<th scope="col">状态</th>
<th scope="col">注解</th>
</tr>
<tr>
<td><a class="external" hreflang="en" lang="en" title="Unknown">Unknown</a></td>
<td><span class="spec-">Unknown</span></td>
<td>定义了系统消息的接口</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<p></p><p class="warning"><strong><a href="https://github.com/mdn/browser-compat-data">We're converting our compatibility data into a machine-readable JSON format</a></strong>.
This compatibility table still uses the old format,
because we haven't yet converted the data it contains.
<strong><a href="/zh-CN/docs/MDN/Contribute/Structures/Compatibility_tables">Find out how you can help!</a></strong></p>
<div class="htab">
<a id="AutoCompatibilityTable" name="AutoCompatibilityTable"></a>
<ul>
<li class="selected"><a>Desktop</a></li>
<li><a>Mobile</a></li>
</ul>
</div><p></p>
<div id="compat-desktop">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari (WebKit)</th>
</tr>
<tr>
<td>Basic support</td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Firefox OS</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td><span style="color: #f00;">未实现</span></td>
<td>1.0</td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
</tr>
</tbody>
</table>
</div>
<h2 id="参见">参见</h2>
<ul>
<li><a href="/zh-CN/docs/Web/API/Window/navigator/mozSetMessageHandler" title="此页面仍未被本地化, 期待您的翻译!"><code>navigator.mozSetMessageHandler()</code></a></li>
<li><a href="/en-US/docs/WebAPI/Web_Activities" title="/en-US/docs/WebAPI/Web_Activities">Web Activities</a></li>
<li><a class="external" href="https://groups.google.com/forum/?fromgroups=#%21topic/mozilla.dev.webapi/o8bkwx0EtmM" title="https://groups.google.com/forum/?fromgroups=#!topic/mozilla.dev.webapi/o8bkwx0EtmM">Discussion on the Mozilla WebAPI mailing list.</a></li>
</ul>
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