Document.createNSResolver()

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句法
注意事项
另请参阅
规范
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相关话题

创建 XPathNSResolver which resolves namespaces with respect to the definitions in scope for a specified node.

句法

nsResolver = document.createNSResolver(node);

参数

node is the node to be used as a context for namespace resolution.

返回值

nsResolver is an XPathNSResolver object.

注意事项

Adapts any DOM node to resolve namespaces so that an XPath expression can be easily evaluated relative to the context of the node where it appeared within the document. This adapter works like the DOM Level 3 method lookupNamespaceURI on nodes in resolving the namespaceURI from a given prefix using the current information available in the node's hierarchy at the time lookupNamespaceURI is called. Also correctly resolves the implicit xml 前缀。

Note, XPath defines QNames without prefix to match only elements in the null namespace. There is no way in XPath to pick up the default namespace as applied to a regular element reference (e.g., p[@id='_myid' ] for xmlns='http://www.w3.org/1999/xhtml' ). To match default elements in a non-null namespace, you either have to refer to a particular element using a form such as *namespace-uri()= http://www.w3.org/1999/xhtml and name()=p[@id='_myid'] ( this approach works well for dynamic XPath expressions where the namespaces might not be known) or use prefixed name tests, and create a namespace resolver mapping the prefix to the namespace. Read more on how to create a user defined namespace resolver if you wish to take the latter approach.

createNSResolver was introduced in DOM Level 3.

另请参阅

规范

规范	状态	注释
DOM (文档对象模型) 3 级 XPath 规范 The definition of 'document.createNSResolver' in that specification.	推荐

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`createNSResolver`	Chrome 1	Edge 12	Firefox Yes	IE ?	Opera ?	Safari ?	WebView Android Yes	Chrome Android Yes	Firefox Android Yes	Opera Android ?	Safari iOS ?	Samsung Internet Android Yes

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完整支持
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元数据

最后修改： Jan 8, 2020

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句法

参数

返回值

注意事项

另请参阅

规范

浏览器兼容性

图例

相关话题