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+---
+title: WeakSet.prototype.clear()
+slug: orphaned/Web/JavaScript/Reference/Global_Objects/WeakSet/clear
+tags:
+  - JavaScript
+  - Method
+  - WeakSet
+  - 废弃
+translation_of: Web/JavaScript/Reference/Global_Objects/WeakSet/clear
+original_slug: Web/JavaScript/Reference/Global_Objects/WeakSet/clear
+---
+<div>{{JSRef}} {{obsolete_header}}</div>
+
+<p><code><strong>clear()</strong></code> 方法用于删除 <code>WeakSet</code> 对象的所有元素，但是已经不是 ECMAScript 的一部分了。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><em>ws</em>.clear();</pre>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_clear方法">使用 <code>clear方法</code></h3>
+
+<pre class="brush: js example-bad">var ws = new WeakSet();
+
+ws.add(window);
+ws.has(window);  // true
+
+ws.clear();
+
+ws.has(window); // false
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<p>没有规范或草案。该方法原本计划包括在 ECMAScript 6，但是在草案 revision 28 (October 14, 2014) 被抛弃了。浏览器原先的实现不久后也被移除了，它从来不是标准的一分子。</p>
+
+<h2 id="浏览器支持">浏览器支持</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>{{CompatNo}} [1]</td>
+   <td>{{CompatNo}}</td>
+   <td>23</td>
+   <td>{{CompatNo}}</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>{{CompatNo}} [1]</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] Added to Firefox in version 34, but removed in version 46. See {{bug(1101817)}}.</p>
+
+<h2 id="相关">相关</h2>
+
+<ul>
+ <li>{{jsxref("WeakSet")}}</li>
+ <li>{{jsxref("WeakSet.prototype.delete()")}}</li>
+</ul>