From 2478646b4648d9c3b98482f186e542fc8ca0cc19 Mon Sep 17 00:00:00 2001 From: Irvin Date: Tue, 17 Aug 2021 02:46:21 +0800 Subject: bring some orphaned docs and relocate according to it's counterpart eng doc (partial revert #1616) (#1618) * Revert "Remove previously orphaned file (#1616)" This reverts commit 49c5601989809c347a5a595e3c5edc08731e5305. * fix broken slugs * rm orphaned docs that eng origin is not available * Web/API/Element/after: sync origin english content --- files/zh-cn/web/api/element/before/index.html | 193 ++++++++++++++++++++++++++ 1 file changed, 193 insertions(+) create mode 100644 files/zh-cn/web/api/element/before/index.html (limited to 'files/zh-cn/web/api/element/before/index.html') diff --git a/files/zh-cn/web/api/element/before/index.html b/files/zh-cn/web/api/element/before/index.html new file mode 100644 index 0000000000..11553a0194 --- /dev/null +++ b/files/zh-cn/web/api/element/before/index.html @@ -0,0 +1,193 @@ +--- +title: Element.before() +slug: Web/API/Element/before +tags: + - API + - DOM + - Method + - Node + - Reference +translation_of: Web/API/Element/before +original_slug: Web/API/ChildNode/before +browser-compat: api.Element.before +--- +
{{APIRef("DOM")}} {{SeeCompatTable}}
+ +

 ChildNode.before 方法可以在ChildNode这个节点的父节点中插入一些列的 {{domxref("Node")}} 或者 {{domxref("DOMString")}} 对象，位置就是在ChildNode节点的前面，{{domxref("DOMString")}} 对象其实和 {{domxref("Text")}}节点一样的方式来完成插入的。

+ +

语法

+ +
[Throws, Unscopable]
+void Element.before((Node or DOMString)... nodes);
+
+ +

Parameters参数

+ +
+
nodes
+
一系列的 {{domxref("Node")}} 或者 {{domxref("DOMString")}} 
+
+ +

Exceptions

+ + + +

Examples事例

+ +

Inserting an element插入元素节点

+ +
var parent = document.createElement("div");
+var child = document.createElement("p");
+parent.appendChild(child);
+var span = document.createElement("span");
+
+child.before(span);
+
+console.log(parent.outerHTML);
+// "<div><span></span><p></p></div>"
+
+ +

Inserting text插入文本节点

+ +
var parent = document.createElement("div");
+var child = document.createElement("p");
+parent.appendChild(child);
+
+child.before("Text");
+
+console.log(parent.outerHTML);
+// "<div>Text<p></p></div>"
+ +

Inserting an element and text同时插入文本和元素

+ +
var parent = document.createElement("div");
+var child = document.createElement("p");
+parent.appendChild(child);
+var span = document.createElement("span");
+
+child.before(span, "Text");
+
+console.log(parent.outerHTML);
+// "<div><span></span>Text<p></p></div>"
+ +

Element.before() is unscopable不可使用区域

+ +

The before() 不能配合with声明使用，See {{jsxref("Symbol.unscopables")}} for more information.

+ +
with(node) {
+  before("foo");
+}
+// ReferenceError: before is not defined
+ +

Polyfill

+ +

兼容ie9或者更高版本的方法，You can polyfill the before() method in Internet Explorer 9 and higher with the following code:

+ +
// from: https://github.com/jserz/js_piece/blob/master/DOM/ChildNode/before()/before().md
+(function (arr) {
+  arr.forEach(function (item) {
+    if (item.hasOwnProperty('before')) {
+      return;
+    }
+    Object.defineProperty(item, 'before', {
+      configurable: true,
+      enumerable: true,
+      writable: true,
+      value: function before() {
+        var argArr = Array.prototype.slice.call(arguments),
+          docFrag = document.createDocumentFragment();
+
+        argArr.forEach(function (argItem) {
+          var isNode = argItem instanceof Node;
+          docFrag.appendChild(isNode ? argItem : document.createTextNode(String(argItem)));
+        });
+
+        this.parentNode.insertBefore(docFrag, this);
+      }
+    });
+  });
+})([Element.prototype, CharacterData.prototype, DocumentType.prototype]);
+ +

Specification

+ + + + + + + + + + + + + + +
SpecificationStatusComment
{{SpecName('DOM WHATWG', '#dom-childnode-before', 'Element.before()')}}{{Spec2('DOM WHATWG')}}Initial definition.
+ +

Browser compatibility

+ +

{{CompatibilityTable}}

+ +
+ + + + + + + + + + + + + + + + + + + +
FeatureChromeFirefox (Gecko)Internet ExplorerOperaSafari
Basic support{{CompatChrome(54.0)}}{{CompatGeckoDesktop(49)}}{{CompatUnknown}}{{CompatOpera(39)}}{{CompatUnknown}}
+
+ +
+ + + + + + + + + + + + + + + + + + + + + + + +
FeatureAndroidAndroid WebviewFirefox Mobile (Gecko)IE MobileOpera MobileSafari MobileChrome for Android
Basic support{{CompatNo}}{{CompatChrome(54.0)}}{{CompatGeckoMobile(49)}}{{CompatUnknown}}{{CompatOpera(39)}}{{CompatUnknown}}{{CompatChrome(54.0)}}
+
+ +

See also

+ + -- cgit v1.2.3-54-g00ecf