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Showing content from http://developer.mozilla.org/zh-CN/docs/Web/API/DOMImplementation/createDocument below:

DOMImplementation.createDocument() - Web API | MDN

DOMImplementation.createDocument()

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DOMImplementation.createDocument()方法创建并返回一个 XMLDocument对象。

语法
doc = document.implementation.createDocument(namespaceURI, qualifiedNameStr, documentType);
参数
namespaceURI

被创建的DOMString 文档的 namespace URI 是 namespace URI ,如果文档不属于任何 namespace URI 就为null.

qualifiedNameStr

DOMString 是否包含要创建文档的限定名称,即可选的前缀和冒号,以及本地的根元素。

documentType 可选

文档的 DocumentType 默认为 null.

例子
var doc = document.implementation.createDocument(
  "http://www.w3.org/1999/xhtml",
  "html",
  null,
);
var body = document.createElementNS("http://www.w3.org/1999/xhtml", "body");
body.setAttribute("id", "abc");
doc.documentElement.appendChild(body);
alert(doc.getElementById("abc")); // [object HTMLBodyElement]
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