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+---
+title: WeakSet.prototype.add()
+slug: Web/JavaScript/Reference/Global_Objects/WeakSet/add
+tags:
+  - ECMAScript 2015
+  - JavaScript
+  - WeakSet
+translation_of: Web/JavaScript/Reference/Global_Objects/WeakSet/add
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>add()</strong></code> 方法在 <code>WeakSet</code> 对象的最后一个元素后添加新的对象。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><code><em>ws</em>.add(value);</code>
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>value</dt>
+ <dd>必须。 将对象添加进 <code>WeakSet</code> 集合中。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p><code>WeakSet</code> 对象。</p>
+
+<h2 id="使用_add_方法">使用 <code>add</code> 方法</h2>
+
+<pre class="brush: js">var ws = new WeakSet();
+
+ws.add(window); // 添加 window 对象进 WeakSet 中
+
+ws.has(window); // true
+
+// Weakset 仅取得对象作为参数
+ws.add(1);
+// 结果为 "TypeError: Invalid value used in weak set" 在 Chrome 浏览器中
+// 并且 "TypeError: 1 is not a non-null object" 在 Firefox 浏览器中</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-weakset.prototype.add', 'WeakSet.prototype.add')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-weakset.prototype.add', 'WeakSet.prototype.add')}}</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>36</td>
+   <td>{{CompatGeckoDesktop(34)}}</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>{{ CompatGeckoMobile(34) }}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("WeakSet")}}</li>
+ <li>{{jsxref("WeakSet.prototype.delete()")}}</li>
+ <li>{{jsxref("WeakSet.prototype.has()")}}</li>
+</ul>