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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: DOMTokenList.add()
+slug: Web/API/DOMTokenList/add
+translation_of: Web/API/DOMTokenList/add
+---
+<p>{{APIRef("DOM")}}</p>
+
+<p>{{domxref("DOMTokenList")}} 接口的 <code><strong>add()</strong></code> 方法将给定的标记添加到列表中。 </p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><var>tokenList</var>.add(<var>token1</var>[, <var>token2</var>[, ...<var>tokenN</var>]]);</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>token<em>N</em></dt>
+ <dd>一个 {{domxref("DOMString")}},表示你要添加到列表里的标记。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p><code>undefined</code></p>
+
+<h2 id="例子">例子</h2>
+
+<p>在下面的例子中,我们使用 {{domxref("Element.classList")}} 将 {{htmlelement("span")}} 元素上设置的类列表检索为 <code>DOMTokenList</code>。然后,我们将新标记添加到列表中,并将列表写入 <code>&lt;span&gt;</code> 元素的{{domxref("Node.textContent")}}。</p>
+
+<p>HTML:</p>
+
+<pre class="brush: html">&lt;span class="a b c"&gt;&lt;/span&gt;</pre>
+
+<p>JavaScript:</p>
+
+<pre class="brush: js">var span = document.querySelector("span");
+var classes = span.classList;
+classes.add("d");
+span.textContent = classes;
+</pre>
+
+<p>结果如下:</p>
+
+<p>{{ EmbedLiveSample('Examples', '100%', 60) }}</p>
+
+<p>你也可以添加多个标记:</p>
+
+<pre class="brush: js">span.classList.add("d", "e", "f");
+</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('DOM WHATWG','#dom-domtokenlist-add','add()')}}</td>
+ <td>{{Spec2('DOM WHATWG')}}</td>
+ <td>Initial definition</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>
+
+
+<p>{{Compat("api.DOMTokenList.add")}}</p>
+</div>