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---
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">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">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">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>
{{Compat}}
<h2 id="相关链接">相关链接</h2>
<ul>
<li>{{jsxref("WeakMap")}}</li>
</ul>
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