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+---
+title: Map.prototype.clear()
+slug: Web/JavaScript/Reference/Global_Objects/Map/clear
+tags:
+  - ECMAScript 2015
+  - JavaScript
+  - Map
+translation_of: Web/JavaScript/Reference/Global_Objects/Map/clear
+---
+<div>{{JSRef}}</div>
+
+<p><code>clear()</code>方法会移除Map对象中的所有元素。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/map-prototype-clear.html")}}</div>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><code><em>myMap</em>.clear();</code>
+</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>{{jsxref("undefined")}}.</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="调用clear方法">调用<code>clear</code>方法</h3>
+
+<pre class="brush: js">var myMap = new Map();
+myMap.set("bar", "baz");
+myMap.set(1, "foo");
+
+myMap.size;       // 2
+myMap.has("bar"); // true
+
+myMap.clear();
+
+myMap.size;       // 0
+myMap.has("bar")  // false
+</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('ES2015', '#sec-map.prototype.clear', 'Map.prototype.clear')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-map.prototype.clear', 'Map.prototype.clear')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容">浏览器兼容</h2>
+
+
+
+<p>{{Compat("javascript.builtins.Map.clear")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Map")}}</li>
+</ul>