From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: Set.prototype.clear()
+slug: Web/JavaScript/Reference/Global_Objects/Set/clear
+tags:
+  - ECMAScript6
+  - JavaScript
+  - Prototype
+  - set
+  - 原型
+  - 方法
+translation_of: Web/JavaScript/Reference/Global_Objects/Set/clear
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>clear()</strong></code> 方法用来清空一个 <code>Set</code> 对象中的所有元素。</p>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox"><code><em>mySet</em>.clear();</code>
+</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>{{jsxref("undefined")}}.</p>
+
+<h2 id="Examples" name="Examples">示例</h2>
+
+<pre class="brush: js">var mySet = new Set();
+mySet.add(1);
+mySet.add("foo");
+
+mySet.size;       // 2
+mySet.has("foo"); // true
+
+mySet.clear();
+
+mySet.size;       // 0
+mySet.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('ES6', '#sec-set.prototype.clear', 'Set.prototype.clear')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-set.prototype.clear', 'Set.prototype.clear')}}</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>{{ 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>38</td>
+   <td>{{CompatGeckoDesktop("19.0")}}</td>
+   <td>11</td>
+   <td>25</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>Chrome for 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>25</td>
+   <td>{{CompatGeckoMobile("19.0")}}</td>
+   <td>{{ CompatNo() }}</td>
+   <td>{{ CompatNo() }}</td>
+   <td>8</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="相关链接"><strong style="font-size: 2.14285714285714rem; font-weight: 700; letter-spacing: -1px; line-height: 30px;">相关链接</strong></h2>
+
+<ul>
+ <li>{{jsxref("Set")}}</li>
+ <li>{{jsxref("Set.prototype.delete()")}}</li>
+</ul>
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