---
title: Node.ownerDocument
slug: Web/API/Node/ownerDocument
translation_of: Web/API/Node/ownerDocument
---
<div>{{APIRef("DOM")}}</div>

<p><code><strong>Node.ownerDocument</strong></code> 唯讀屬性會回傳一個此節點所屬的的頂層 <code>document</code> 物件。</p>

<h2 id="語法">語法</h2>

<pre class="syntaxbox"><var>document</var> = <var>element</var>.ownerDocument
</pre>

<ul>
 <li><code>document</code> is the {{domxref("Document", "document")}} object parent of the current element.</li>
</ul>

<h2 id="範例">範例</h2>

<pre class="brush:js">// given a node "p", get the top-level HTML child
// of the document object

var d = p.ownerDocument;
var html = d.documentElement;
</pre>

<h2 id="備註">備註</h2>

<p>The <code>document</code> object returned by this property is the main object with which all the child nodes in the actual HTML document are created. If this property is used on a node that is itself a document, the result is <code>null</code>.</p>

<h2 id="規範">規範</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th>Specification</th>
   <th>Status</th>
   <th>Comment</th>
  </tr>
  <tr>
   <td>{{SpecName("DOM4", "#dom-node-ownerdocument", "Node.ownerDocument")}}</td>
   <td>{{Spec2("DOM4")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td>{{SpecName("DOM3 Core", "core.html#node-ownerDoc", "Node.ownerDocument")}}</td>
   <td>{{Spec2("DOM3 Core")}}</td>
   <td>No change</td>
  </tr>
  <tr>
   <td>{{SpecName("DOM2 Core", "core.html#node-ownerDoc", "Node.ownerDocument")}}</td>
   <td>{{Spec2("DOM2 Core")}}</td>
   <td>Initial definition</td>
  </tr>
 </tbody>
</table>

<h2 id="瀏覽器相容性">瀏覽器相容性</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>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}<sup>[1]</sup></td>
   <td>6.0<sup>[2]</sup></td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatUnknown}}</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>{{CompatUnknown}}</td>
   <td>{{CompatVersionUnknown}}<sup>[1]</sup></td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<p>[1] Starting in Gecko 9.0 {{geckoRelease("9.0")}}, the <code>ownerDocument</code> of doctype nodes (that is, nodes for which {{domxref("Node.nodeType")}} is <code>Node.DOCUMENT_TYPE_NODE</code> or 10) is no longer <code>null</code>. Instead, the <code>ownerDocument</code> is the document on which <a href="/en-US/docs/DOM/DOMImplementation.createDocumentType"><code>document.implementation.createDocumentType()</code></a> was called.</p>

<p>[2] <a href="http://msdn.microsoft.com/en-us/library/ie/ms534315(v=vs.85).aspx">http://msdn.microsoft.com/en-us/library/ie/ms534315(v=vs.85).aspx</a></p>