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+---
+title: Navigator.mozIsLocallyAvailable()
+slug: Web/API/Navigator/mozIsLocallyAvailable
+translation_of: Web/API/Navigator/mozIsLocallyAvailable
+---
+<p>{{APIRef("HTML DOM")}}{{Non-standard_header}}</p>
+
+<h3 id="Summary" name="Summary">概述</h3>
+
+<p>查询某个URI上的资源是否是本地可用的.</p>
+
+<h3 id="Syntax" name="Syntax">语法</h3>
+
+<pre class="eval">window.navigator.mozIsLocallyAvailable(<em>uri</em>, <em>ifOffline</em>);
+</pre>
+
+<ul>
+ <li><code>uri</code> 将要查询本地可用性的的资源的URI.</li>
+ <li><code>ifOffline</code> 是否检查离线资源缓存<code>.</code></li>
+</ul>
+
+<h3 id="Example" name="Example">例子</h3>
+
+<pre class="eval">var available = navigator.mozIsLocallyAvailable("http:www.example.com/my-image-file.png", true);
+if (available) {
+  /* 该离线资源可用 */
+} else {
+  alert("离线资源不可用,必须联网.");
+}
+</pre>
+
+<h3 id="Notes" name="Notes">备注</h3>
+
+<p>{{ Note("查询的URI和当前页面的URI不同域的话,会抛出安全异常.") }}</p>
+
+<h3 id="Specification" name="Specification">规范</h3>
+
+<p>无规范; 这里有一些可用信息: <a class="external" href="http://www.campd.org/stuff/Offline%20Cache.html">将资源标记为离线可用</a>.</p>
+
+<p> </p>
+
+<p>{{ languages( { "fr": "fr/DOM/window.navigator.isLocallyAvailable", "en": "en/DOM/window.navigator.isLocallyAvailable", "ja": "ja/DOM/window.navigator.mozIsLocallyAvailable" } ) }}</p>