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+---
+title: Map.prototype.get()
+slug: Web/JavaScript/Reference/Global_Objects/Map/get
+tags:
+  - ECMAScript 2015
+  - JavaScript
+  - Map
+  - Method
+  - Prototype
+  - Reference
+translation_of: Web/JavaScript/Reference/Global_Objects/Map/get
+original_slug: Web/JavaScript/Reference/Global_Objects/Map/get
+browser-compat: javascript.builtins.Map.get
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>get()</strong></code> 方法返回某个 <code>Map</code> 对象中的一个指定元素。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/map-prototype-get.html")}}</div>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><code><em>myMap</em>.get(key);</code></pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>key</dt>
+ <dd>必须参数，也是它唯一的参数，要从目标 <code>Map</code> 对象中获取的元素的键。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>返回一个 <code>Map</code> 对象中与指定键相关联的值，如果找不到这个键则返回 <code>undefined</code>。</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_get_方法">使用 <code>get</code> 方法</h3>
+
+<pre class="brush: js">var myMap = new Map();
+myMap.set("bar", "foo");
+
+myMap.get("bar");  // 返回 "foo"
+myMap.get("baz");  // 返回 undefined
+</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.get', 'Map.prototype.get')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-map.prototype.get', 'Map.prototype.get')}}</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.get")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{jsxref("Map")}}</li>
+ <li>{{jsxref("Map.prototype.set()")}}</li>
+ <li>{{jsxref("Map.prototype.has()")}}</li>
+</ul>