Element.setAttributeNS()

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setAttributeNS adds a new attribute or changes the value of an attribute with the given namespace and name.

element.setAttributeNS(namespace, name, value)

namespace is a string specifying the namespace of the attribute.
名称 is a string identifying the attribute by its qualified name; that is, a namespace prefix followed by a colon followed by a local name.
value is the desired string value of the new attribute.

let d = document.getElementById('d1');
d.setAttributeNS('http://www.mozilla.org/ns/specialspace', 'spec:align', 'center');

DOM methods dealing with element's attributes:

Not namespace-aware, most commonly used methods	Namespace-aware variants (DOM Level 2)	DOM Level 1 methods for dealing with `Attr` nodes directly (seldom used)	DOM Level 2 namespace-aware methods for dealing with `Attr` nodes directly (seldom used)
`setAttribute` (DOM 1)	`setAttributeNS`	`setAttributeNode`	`setAttributeNodeNS`
`getAttribute` (DOM 1)	`getAttributeNS`	`getAttributeNode`	`getAttributeNodeNS`
`hasAttribute` (DOM 2)	`hasAttributeNS`	-	-
`removeAttribute` (DOM 1)	`removeAttributeNS`	`removeAttributeNode`	-

setAttributeNS is the only method for namespaced attributes which expects the fully qualified name, i.e. "namespace:localname" .

规范	状态	注释
DOM The definition of 'document.setAttributeNS' in that specification.	实时标准

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
`setAttributeNS`	Chrome Yes	Edge 12	Firefox Yes	IE ?	Opera Yes	Safari 6	WebView Android Yes	Chrome Android Yes	Firefox Android Yes	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes