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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: StorageManager.estimate()
+slug: Web/API/StorageManager/estimate
+translation_of: Web/API/StorageManager/estimate
+---
+<p>{{securecontext_header}}{{APIRef("Storage")}}</p>
+
+<p><strong><code>estimate()</code></strong>方法是{{domxref("StorageManager")}}的一个接口,用于估算某一个域名(或一个站点)下Storage Manager的总存储空间和已经使用了的存储空间。此方法为一个异步方法,如果此方法可用,那么其返回一个结果为resolved的{{jsxref("Promise")}}对象。resolved接收的参数是一个带有已使用数据存储空间和总可用总存储空间的{{domxref("StorageEstimate")}}对象。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">var <em>estimatePromise</em> = <em>StorageManager</em>.estimate();</pre>
+
+<h3 id="参数">参数</h3>
+
+<p>无</p>
+
+<h3 id="返回值">返回值</h3>
+
+<p>{{domxref('StorageEstimate')}}类型的状态为resolved的{{jsxref('Promise')}}</p>
+
+<p>此数据包含了此应用(或域名)可用的存储空间({{domxref("StorageEstimate.quota")}})和目前已经使用了的存储空间({{domxref("StorageEstimate.usage")}})。</p>
+
+<p>这些值不是明确的数字,在进行压缩,重复数据删除和出于安全原因起见进行了混淆之后,这个数据是不精确的。</p>
+
+<p>你可能会发现不同的应用或站点分配的存储空间不同,具体取决于用户访问频率,和网站受欢迎程度等数据。</p>
+
+<h2 id="Example" name="Example">示例</h2>
+
+<p>在这个示例中,我们使用estimate()得到目前所使用的存储空间占全部存储空间的百分比。</p>
+
+<h3 id="HTML_内容">HTML 内容</h3>
+
+<pre class="brush: html">&lt;p&gt;
+ You're currently using about &lt;span id="percent"&gt;
+ &lt;/span&gt;% of your available storage.
+&lt;/p&gt;
+</pre>
+
+<h3 id="JavaScript_内容">JavaScript 内容</h3>
+
+<pre class="brush: js">navigator.storage.estimate().then(function(estimate) {
+ document.getElementById("percent").innerHTML =
+ (estimate.usage / estimate.quota * 100).toFixed(2);
+});
+</pre>
+
+<h3 id="结果">结果</h3>
+
+<p>{{ EmbedLiveSample('Example', 600, 40) }}</p>
+
+<h2 id="规范">规范</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('Storage','#dom-storagemanager-estimate','estimate()')}}</td>
+ <td>{{Spec2('Storage')}}</td>
+ <td>Initial definition.</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("api.StorageManager.estimate")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>Storage API</li>
+ <li>{{domxref("Storage")}}, the object returned by {{domxref("Window.localStorage")}}</li>
+ <li>{{domxref("StorageManager")}}</li>
+ <li>{{domxref("navigator.storage")}}</li>
+</ul>