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authorMDN <actions@users.noreply.github.com>2021-07-17 00:35:32 +0000
committerMDN <actions@users.noreply.github.com>2021-07-17 00:35:32 +0000
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----
-title: Map.prototype.keys()
-slug: Web/JavaScript/Reference/Global_Objects/Map/keys
-translation_of: Web/JavaScript/Reference/Global_Objects/Map/keys
-tags:
- - ECMAScript 2015
- - Iterator
- - JavaScript
- - Map
- - Method
- - Prototype
-browser-compat: javascript.builtins.Map.keys
----
-<div>{{JSRef}}</div>
-
-<p><code><strong>keys()</strong></code> 返回一个引用的 <code><strong>Iterator</strong></code> 对象。它包含按照顺序插入 <code>Map</code> 对象中每个元素的key值。</p>
-
-<div>{{EmbedInteractiveExample("pages/js/map-prototype-keys.html")}}</div>
-
-
-
-<h2 id="语法">语法</h2>
-
-<pre class="syntaxbox notranslate"><code><em>myMap</em>.keys()</code></pre>
-
-<h3 id="返回值">返回值</h3>
-
-<p>一个存在引用关系的 {{jsxref("Map")}} iterator 对象.</p>
-
-<h2 id="例子">例子</h2>
-
-<h3 id="使用_keys">使用 <code>keys()</code></h3>
-
-<pre class="brush:js notranslate">var myMap = new Map();
-myMap.set("0", "foo");
-myMap.set(1, "bar");
-myMap.set({}, "baz");
-
-var mapIter = myMap.keys();
-
-console.log(mapIter.next().value); // "0"
-console.log(mapIter.next().value); // 1
-console.log(mapIter.next().value); // Object
-</pre>
-
-<h2 id="规范">规范</h2>
-
-<table class="standard-table">
- <tbody>
- <tr>
- <th scope="col">规范</th>
- <th scope="col">状态</th>
- <th scope="col">备注</th>
- </tr>
- <tr>
- <td>{{SpecName('ES2015', '#sec-map.prototype.keys', 'Map.prototype.keys')}}</td>
- <td>{{Spec2('ES2015')}}</td>
- <td>Initial definition.</td>
- </tr>
- <tr>
- <td>{{SpecName('ESDraft', '#sec-map.prototype.keys', 'Map.prototype.keys')}}</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.keys")}}</p>
-
-<h2 id="参见">参见</h2>
-
-<ul>
- <li>{{jsxref("Map.prototype.entries()")}}</li>
- <li>{{jsxref("Map.prototype.values()")}}</li>
-</ul>