From 9daad59fa2578dcc9603833b0a9a22b93d362b5e Mon Sep 17 00:00:00 2001 From: MDN Date: Fri, 16 Apr 2021 00:10:51 +0000 Subject: [CRON] sync translated content --- .../api/parentnode/firstelementchild/index.html | 95 ---------------------- 1 file changed, 95 deletions(-) delete mode 100644 files/zh-tw/web/api/parentnode/firstelementchild/index.html (limited to 'files/zh-tw/web/api') diff --git a/files/zh-tw/web/api/parentnode/firstelementchild/index.html b/files/zh-tw/web/api/parentnode/firstelementchild/index.html deleted file mode 100644 index 4fa9722123..0000000000 --- a/files/zh-tw/web/api/parentnode/firstelementchild/index.html +++ /dev/null @@ -1,95 +0,0 @@ ---- -title: ParentNode.firstElementChild -slug: Web/API/ParentNode/firstElementChild -translation_of: Web/API/ParentNode/firstElementChild ---- -

{{ APIRef("DOM") }}

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ParentNode.firstElementChild 介面會會返回 ParentNode的第一個子元素(唯讀) ，如果該節點沒有子節點則返回null。

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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, firstElementChild moved to {{domxref("ParentNode")}}. This is a fairly technical change that shouldn't affect compatibility.

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語法

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var element = node.firstElementChild;
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範例

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<ul id="foo">
-  <li>First  (1)</li>
-  <li>Second (2)</li>
-  <li>Third  (3)</li>
-</ul>
-
-<script>
-var foo = document.getElementById('foo');
-// yields: First  (1)
-console.log(foo.firstElementChild.textContent);
-</script>
-
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適用於IE8, IE9 和 Safari的Polyfill

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// Overwrites native 'firstElementChild' prototype.
-// Adds Document & DocumentFragment support for IE9 & Safari.
-;(function(constructor) {
-    if (constructor &&
-        constructor.prototype &&
-        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);
-
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規範

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SpecificationStatusComment
{{SpecName('DOM WHATWG', '#dom-parentnode-firstelementchild', 'ParentNode.firstElementChild')}}{{Spec2('DOM WHATWG')}}Split the ElementTraversal interface in {{domxref("ChildNode")}} and ParentNode. This method is now defined on the latter.
- The {{domxref("Document")}} and {{domxref("DocumentFragment")}} implemented the new interfaces.
{{SpecName('Element Traversal', '#attribute-firstElementChild', 'ElementTraversal.firstElementChild')}}{{Spec2('Element Traversal')}}Added its initial definition to the ElementTraversal pure interface and use it on {{domxref("Element")}}.
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瀏覽器相容性

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{{Compat("api.ParentNode.firstElementChild")}}

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參見

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