---
title: ShadowRoot.mode
slug: Web/API/ShadowRoot/mode
translation_of: Web/API/ShadowRoot/mode
---
<div>{{APIRef("Shadow DOM")}}{{SeeCompatTable}}</div>

<p><strong><code>mode</code></strong> 是 {{domxref("ShadowRoot")}}  的只读属性，它返回 <code>ShadowRoot</code> 创建时的模式 ("<code>open</code>" 或者 "<code>closed</code>") 。</p>

<p>当 <code>ShadowRoot</code> 的 <code>mode</code> 是 "<code>closed</code>" 时， <code>ShadowRoot</code> 的内部实现无法被 JavaScript 访问及修改 — 也就是说将该实现不公开，例如，<a href="https://developer.mozilla.org/zh-CN/docs/Web/HTML/Element/video" title="HTML &lt;video> 元素 用于在HTML或者XHTML文档中嵌入视频内容。"><code>&lt;video&gt;</code></a> 标签内部实现无法被 JavaScript 访问及修改。</p>

<h2 id="Syntax">Syntax</h2>

<pre class="syntaxbox">var <em>mode</em> = <em>shadowRoot</em>.mode</pre>

<h3 id="Value">Value</h3>

<p>值为 "<code>open</code>"  或者  "<code>closed</code>".</p>

<h2 id="Specifications">Specifications</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-shadowroot-mode','ShadowRoot.mode')}}</td>
   <td>{{Spec2('DOM WHATWG')}}</td>
   <td> </td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility">Browser compatibility</h2>

<p>{{CompatibilityTable}}</p>

<div id="compat-desktop">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Chrome</th>
   <th>Edge</th>
   <th>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari (WebKit)</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>53</td>
   <td>{{CompatNo}}<sup>[1]</sup></td>
   <td>{{CompatNo}}<sup>[2]</sup></td>
   <td>{{CompatNo}}</td>
   <td>40</td>
   <td>10</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Android</th>
   <th>Edge</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>IE Phone</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>53</td>
   <td>{{CompatNo}}<sup>[1]</sup></td>
   <td>{{CompatNo}}<sup>[2]</sup></td>
   <td>{{CompatNo}}</td>
   <td>40</td>
   <td>10.1</td>
  </tr>
 </tbody>
</table>
</div>

<p>[1] This feature is not implemented yet. See the <a href="https://developer.microsoft.com/en-us/microsoft-edge/platform/status/shadowdom/">Edge platform status</a>.</p>

<p>[2] This feature is not implemented yet. See {{bug(1205323)}}.</p>