---
title: Map.prototype.delete()
slug: Web/JavaScript/Reference/Global_Objects/Map/delete
tags:
  - ECMAScript 2015
  - JavaScript
  - Map
  - Method
  - Prototype
translation_of: Web/JavaScript/Reference/Global_Objects/Map/delete
---
<div>{{JSRef}}</div>

<p><strong> </strong><code><strong><strong>delete()</strong></strong></code><strong> </strong>方法用于移除 <code>Map</code> 对象中指定的元素。</p>

<div>{{EmbedInteractiveExample("pages/js/map-prototype-delete.html")}}</div>



<h2 id="语法">语法</h2>

<pre class="brush: js">myMap.delete(key);</pre>

<h3 id="参数">参数</h3>

<dl>
 <dt>key</dt>
 <dd>必须。从 <code>Map</code> 对象中移除的元素的键。</dd>
</dl>

<h3 id="返回值">返回值</h3>

<dl>
 <dt>Boolean</dt>
 <dd>如果 <code>Map</code> 对象中存在该元素，则移除它并返回<em> <code>true</code></em>；否则如果该元素不存在则返回 <code><em>false</em></code>。</dd>
</dl>

<h2 id="示例">示例</h2>

<h3 id="使用_delete_方法">使用 <code>delete</code> 方法</h3>

<pre class="brush: js">var myMap = new Map();
myMap.set("bar", "foo");

myMap.delete("bar"); // 返回 true。成功地移除元素
myMap.has("bar");    // 返回 false。"bar" 元素将不再存在于 Map 实例中
</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-map.prototype.delete', 'Map.prototype.delete')}}</td>
   <td>{{Spec2('ES6')}}</td>
   <td>Initial definition.</td>
  </tr>
  <tr>
   <td>{{SpecName('ESDraft', '#sec-map.prototype.delete', 'Map.prototype.delete')}}</td>
   <td>{{Spec2('ESDraft')}}</td>
   <td> </td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性">浏览器兼容性</h2>

<div class="hidden">
<p>The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
</div>

<p>{{Compat("javascript.builtins.Map.delete")}}</p>

<h2 id="相关链接">相关链接</h2>

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