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---
title: Storage.clear()
slug: Web/API/Storage/clear
translation_of: Web/API/Storage/clear
---
<p>{{APIRef("Web Storage API")}}</p>
<p><code>clear()</code> 是 {{domxref("Storage")}} 接口的一个方法，调用它可以清空存储对象里所有的键值。</p>
<h2 id="语法">语法</h2>
<pre class="brush: js"><em>storage</em>.clear();</pre>
<h3 id="参数">参数</h3>
<p><em>无。</em></p>
<h3 id="返回值">返回值</h3>
<p><em>无。</em></p>
<h2 id="示例">示例</h2>
<p>下面的函数在本地存储里面创建三个数据项，然后使用 <code>clear()</code> 把它们全部移除。</p>
<pre class="brush: js">function populateStorage() {
localStorage.setItem('bgcolor', 'red');
localStorage.setItem('font', 'Helvetica');
localStorage.setItem('image', 'myCat.png');
localStorage.clear();
}</pre>
<div class="note">
<p><strong>备注：</strong>一个实际的例子 <a href="https://github.com/mdn/web-storage-demo">Web Storage Demo</a>。</p>
</div>
<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('Web Storage', '#dom-storage-clear', 'clear()')}}</td>
<td>{{Spec2('Web Storage')}}</td>
<td> </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>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari (WebKit)</th>
</tr>
<tr>
<td>localStorage</td>
<td>4</td>
<td>3.5</td>
<td>8</td>
<td>10.50</td>
<td>4</td>
</tr>
<tr>
<td>sessionStorage</td>
<td>5</td>
<td>2</td>
<td>8</td>
<td>10.50</td>
<td>4</td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Phone</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td>2.1</td>
<td>{{ CompatUnknown }}</td>
<td>8</td>
<td>11</td>
<td>iOS 3.2</td>
</tr>
</tbody>
</table>
</div>
<p>各浏览器支持的 localStorage 和 sessionStorage 容量不同。测试页面：<a class="external" href="http://dev-test.nemikor.com/web-storage/support-test/" title="http://dev-test.nemikor.com/web-storage/support-test/">detailed rundown of all the storage capacities for various browsers</a>.</p>
<div class="note">
<p><strong>Note: </strong>since iOS 5.1, Safari Mobile stores localStorage data in the cache folder, which is subject to occasional clean up, at the behest of the OS, typically if space is short.</p>
</div>
<h2 id="相关链接">相关链接</h2>
<p><a href="/zh-CN/docs/Web/API/Web_Storage_API/Using_the_Web_Storage_API">使用 Web Storage API</a></p>
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