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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:42:52 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:42:52 -0500
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+---
+title: WeakMap.prototype.get()
+slug: Web/JavaScript/Reference/Global_Objects/WeakMap/get
+translation_of: Web/JavaScript/Reference/Global_Objects/WeakMap/get
+---
+<div>{{JSRef}}</div>
+
+<p>Метод <code><strong>get()</strong></code> возвращает элемент из объекта WeakMap,</p>
+
+<h2 id="Синтаксис">Синтаксис</h2>
+
+<pre class="syntaxbox"><code><em>wm</em>.get(key);</code></pre>
+
+<h3 id="Параметры">Параметры</h3>
+
+<dl>
+ <dt>key</dt>
+ <dd>Обязателен. Ключ элемента, который будет возвращён из объекта WeakMap.</dd>
+</dl>
+
+<h3 id="Возвращаемое_значение">Возвращаемое значение</h3>
+
+<p>Возвращает элемент по указанному ключу или undefined, если ключ не может быть найден в объекте WeakMap.</p>
+
+<h2 id="Примеры">Примеры</h2>
+
+<h3 id="Использование_метода_get">Использование метода get</h3>
+
+<pre class="brush: js">var wm = new WeakMap();
+wm.set(window, "foo");
+
+wm.get(window); // Возвращает "foo".
+wm.get("baz"); // Возвращает undefined.
+</pre>
+
+<h2 id="Спецификация">Спецификация</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.get', 'WeakMap.prototype.get')}}</td>
+ <td>{{Spec2('ES6')}}</td>
+ <td>Изначальное определение.</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Совместимость_с_браузерами">Совместимость с браузерами</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Chrome</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>36</td>
+ <td>{{CompatGeckoDesktop("6.0")}}</td>
+ <td>11</td>
+ <td>23</td>
+ <td>7.1</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Android</th>
+ <th>Firefox Mobile (Gecko)</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>8</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="Firefox-specific_notes">Firefox-specific notes</h2>
+
+<ul>
+ <li>Prior to SpiderMonkey 38 {{geckoRelease(38)}}, this method threw a {{jsxref("TypeError")}} when the key parameter was not an object. However, the latest ES6 standard specifies to return <code>undefined</code> instead. Furthermore, <code>WeakMap.prototype.get</code> accepted an optional second argument as a fallback value, which is not part of the standard. Both non-standard behaviors are removed in version 38 and higher ({{bug(1127827)}}).</li>
+</ul>
+
+<h2 id="Смотрите_также">Смотрите также</h2>
+
+<ul>
+ <li>{{jsxref("WeakMap")}}</li>
+ <li>{{jsxref("WeakMap.set()")}}</li>
+ <li>{{jsxref("WeakMap.has()")}}</li>
+</ul>