blob: 6bbd943f7faf866743c2ae33341550b2bf56fd21 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
---
title: Map.prototype.delete()
slug: Web/JavaScript/Reference/Global_Objects/Map/delete
tags:
- ECMAScript 2015
- JavaScript
- Map
- Method
- Prototype
- Reference
translation_of: Web/JavaScript/Reference/Global_Objects/Map/delete
original_slug: Web/JavaScript/Reference/Global_Objects/Map/delete
browser-compat: javascript.builtins.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>
<p>{{Compat("javascript.builtins.Map.delete")}}</p>
<h2 id="相关链接">相关链接</h2>
<ul>
<li>{{jsxref("Map")}}</li>
</ul>
|
