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authorMDN <actions@users.noreply.github.com>2021-04-16 00:10:51 +0000
committerMDN <actions@users.noreply.github.com>2021-04-16 00:10:51 +0000
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----
-title: ParentNode.firstElementChild
-slug: Web/API/ParentNode/firstElementChild
-translation_of: Web/API/ParentNode/firstElementChild
----
-<p>{{ APIRef("DOM") }}</p>
-
-<p><strong><code>ParentNode.firstElementChild</code></strong> 介面會會返回 <code>ParentNode</code>的第一個子元素(唯讀) ,如果該節點沒有子節點則返回<code>null</code>。</p>
-
-<div class="note">
-<p>This property was initially defined in the {{domxref("ElementTraversal")}} pure interface. As this interface contained two distinct set of properties, one aimed at {{domxref("Node")}} that have children, one at those that are children, they have been moved into two separate pure interfaces, {{domxref("ParentNode")}} and {{domxref("ChildNode")}}. In this case, <code>firstElementChild</code> moved to {{domxref("ParentNode")}}. This is a fairly technical change that shouldn't affect compatibility.</p>
-</div>
-
-<h2 id="Syntax_and_values" name="Syntax_and_values">語法</h2>
-
-<pre class="syntaxbox">var <em>element</em> = node.firstElementChild;
-</pre>
-
-<h2 id="Example" name="Example">範例</h2>
-
-<pre class="brush: html">&lt;ul id="foo"&gt;
- &lt;li&gt;First (1)&lt;/li&gt;
- &lt;li&gt;Second (2)&lt;/li&gt;
- &lt;li&gt;Third (3)&lt;/li&gt;
-&lt;/ul&gt;
-
-&lt;script&gt;
-var foo = document.getElementById('foo');
-// yields: First (1)
-console.log(foo.firstElementChild.textContent);
-&lt;/script&gt;
-</pre>
-
-<h2 id="適用於IE8_IE9_和_Safari的Polyfill">適用於IE8, IE9 和 Safari的Polyfill</h2>
-
-<pre class="brush: js">// Overwrites native 'firstElementChild' prototype.
-// Adds Document &amp; DocumentFragment support for IE9 &amp; Safari.
-;(function(constructor) {
- if (constructor &amp;&amp;
- constructor.prototype &amp;&amp;
- constructor.prototype.firstElementChild == null) {
- Object.defineProperty(constructor.prototype, 'firstElementChild', {
- get: function() {
- var node, nodes = this.childNodes, i = 0;
- while (node = nodes[i++]) {
- if (node.nodeType === 1) {
- return node;
- }
- }
- return null;
- }
- });
- }
-})(window.Node || window.Element);
-</pre>
-
-<h2 id="規範">規範</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-parentnode-firstelementchild', 'ParentNode.firstElementChild')}}</td>
- <td>{{Spec2('DOM WHATWG')}}</td>
- <td>Split the <code>ElementTraversal</code> interface in {{domxref("ChildNode")}} and <code>ParentNode</code>. This method is now defined on the latter.<br>
- The {{domxref("Document")}} and {{domxref("DocumentFragment")}} implemented the new interfaces.</td>
- </tr>
- <tr>
- <td>{{SpecName('Element Traversal', '#attribute-firstElementChild', 'ElementTraversal.firstElementChild')}}</td>
- <td>{{Spec2('Element Traversal')}}</td>
- <td>Added its initial definition to the <code>ElementTraversal</code> pure interface and use it on {{domxref("Element")}}.</td>
- </tr>
- </tbody>
-</table>
-
-<h2 id="瀏覽器相容性">瀏覽器相容性</h2>
-
-
-
-<p>{{Compat("api.ParentNode.firstElementChild")}}</p>
-
-<h2 id="參見">參見</h2>
-
-<ul>
- <li>{{domxref("NonDocumentTypeChildNode.nextElementSibling")}}</li>
- <li>{{domxref("ParentNode.lastElementChild")}}</li>
- <li>The {{domxref("ParentNode")}} and {{domxref("ChildNode")}} pure interfaces.</li>
- <li>
- <div class="syntaxbox">Object types implementing this pure interface: {{domxref("Document")}}, {{domxref("Element")}}, and {{domxref("DocumentFragment")}}.</div>
- </li>
-</ul>