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107 lines
4.0 KiB
HTML
107 lines
4.0 KiB
HTML
<article id="wikiArticle">
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<div></div>
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<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>
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<h2 id="语法">语法</h2>
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<pre><code class="language-javascript"><code><em>ws</em>.add(value);</code>
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</code></pre>
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<h3 id="参数">参数</h3>
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<dl>
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<dt>value</dt>
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<dd>必须。 将对象添加进 <code>WeakSet</code> 集合中。</dd>
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</dl>
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<h3 id="返回值">返回值</h3>
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<p><code>WeakSet</code> 对象。</p>
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<h2 id="使用_add_方法">使用 <code>add</code> 方法</h2>
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<pre><code class="language-javascript">var ws = new WeakSet();
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ws.add(window); // 添加 window 对象进 WeakSet 中
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ws.has(window); // true
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// Weakset 仅取得对象作为参数
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ws.add(1);
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// 结果为 "TypeError: Invalid value used in weak set" 在 Chrome 浏览器中
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// 并且 "TypeError: 1 is not a non-null object" 在 Firefox 浏览器中</code></pre>
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<h2 id="规范">规范</h2>
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<table class="standard-table">
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<tbody>
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<tr>
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<th scope="col">Specification</th>
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<th scope="col">Status</th>
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<th scope="col">Comment</th>
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</tr>
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<tr>
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<td><a class="external" href="https://www.ecma-international.org/ecma-262/6.0/#sec-weakset.prototype.add" hreflang="en" lang="en" rel="noopener">ECMAScript 2015 (6th Edition, ECMA-262)<br/><small lang="zh-CN">WeakSet.prototype.add</small></a></td>
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<td><span class="spec-Standard">Standard</span></td>
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<td>Initial definition.</td>
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</tr>
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<tr>
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<td><a class="external" href="https://tc39.github.io/ecma262/#sec-weakset.prototype.add" hreflang="en" lang="en" rel="noopener">ECMAScript Latest Draft (ECMA-262)<br/><small lang="zh-CN">WeakSet.prototype.add</small></a></td>
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<td><span class="spec-Draft">Draft</span></td>
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<td> </td>
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</tr>
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</tbody>
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</table>
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<h2 id="浏览器兼容性">浏览器兼容性</h2>
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<p></p><div class="blockIndicator warning"><strong><a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">We're converting our compatibility data into a machine-readable JSON format</a></strong>.
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This compatibility table still uses the old format,
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because we haven't yet converted the data it contains.
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<strong><a class="new" href="/zh-CN/docs/MDN/Contribute/Structures/Compatibility_tables" rel="nofollow">Find out how you can help!</a></strong></div>
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<div class="htab">
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<a id="AutoCompatibilityTable" name="AutoCompatibilityTable"></a>
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<ul>
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<li class="selected"><a>Desktop</a></li>
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<li><a>Mobile</a></li>
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</ul>
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</div><p></p>
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<div id="compat-desktop">
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<table class="compat-table">
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<tbody>
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<tr>
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<th>Feature</th>
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<th>Chrome</th>
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<th>Firefox (Gecko)</th>
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<th>Internet Explorer</th>
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<th>Opera</th>
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<th>Safari</th>
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</tr>
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<tr>
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<td>Basic support</td>
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<td>36</td>
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<td><a href="/en-US/Firefox/Releases/34" title="Released on 2014-12-01.">34</a> (34)</td>
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<td><span style="color: #f00;">未实现</span></td>
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<td>23</td>
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<td><span style="color: #f00;">未实现</span></td>
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</tr>
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</tbody>
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</table>
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</div>
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<div id="compat-mobile">
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<table class="compat-table">
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<tbody>
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<tr>
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<th>Feature</th>
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<th>Android</th>
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<th>Firefox Mobile (Gecko)</th>
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<th>IE Mobile</th>
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<th>Opera Mobile</th>
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<th>Safari Mobile</th>
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</tr>
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<tr>
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<td>Basic support</td>
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<td><span style="color: #f00;">未实现</span></td>
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<td>34.0 (34)</td>
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<td><span style="color: #f00;">未实现</span></td>
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<td><span style="color: #f00;">未实现</span></td>
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<td><span style="color: #f00;">未实现</span></td>
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</tr>
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</tbody>
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</table>
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</div>
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<h2 id="相关链接">相关链接</h2>
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<ul>
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<li><a href="Reference/Global_Objects/WeakSet" title="WeakSet 对象允许你将弱保持对象存储在一个集合中。"><code>WeakSet</code></a></li>
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<li><a href="Reference/Global_Objects/WeakSet/delete" title="delete() 方法从 WeakSet 对象中移除指定的元素。"><code>WeakSet.prototype.delete()</code></a></li>
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<li><a href="Reference/Global_Objects/WeakSet/has" title="has() 方法根据 WeakSet 是否存在相应对象返回布尔值。"><code>WeakSet.prototype.has()</code></a></li>
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</ul>
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</article> |