---
title: WeakMap.prototype.delete()
slug: Web/JavaScript/Reference/Global_Objects/WeakMap/delete
translation_of: Web/JavaScript/Reference/Global_Objects/WeakMap/delete
---
<div>{{JSRef("Global_Objects", "WeakMap")}}</div>

<h2 id="Summary" name="Summary">概述</h2>

<p><code><strong>delete()</strong></code> 方法可以从一个 <code>WeakMap</code> 对象中删除指定的元素。</p>

<h2 id="Syntax" name="Syntax">语法</h2>

<pre class="syntaxbox"><code><em>wm</em>.delete(key);</code></pre>

<h3 id="Parameters参数">Parameters参数</h3>

<dl>
 <dt>key</dt>
 <dd>需要删除的元素的键</dd>
</dl>

<h3 id="返回值">返回值</h3>

<p>如果成功删除，返回 <code>true</code>，否则返回 <code>false</code>。</p>

<h2 id="Examples" name="Examples">示例</h2>

<pre class="brush: js;">var wm = new WeakMap();
wm.set(window, "foo");

wm.delete(window); // 返回 true，表示删除成功。

wm.has(window);    // 返回 false，因为 window 对象已经被删除了。
</pre>

<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('ES6', '#sec-weakmap.prototype.delete', 'WeakMap.prototype.delete')}}</td>
   <td>{{Spec2('ES6')}}</td>
   <td>Initial definition.</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 (SpiderMonkey)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatVersionUnknown}}[1]</td>
   <td>{{CompatGeckoDesktop("6.0")}}</td>
   <td>11</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Android</th>
   <th>Firefox Mobile (SpiderMonkey)</th>
   <th>IE Mobile</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatGeckoMobile("6.0")}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
  </tr>
 </tbody>
</table>
</div>

<h2 id="相关链接">相关链接</h2>

<ul>
 <li>{{jsxref("WeakMap")}}</li>
</ul>