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Showing content from https://developer.cdn.mozilla.net/zh-CN/docs/Web/API/Document/createCDATASection below:

Document.createCDATASection() - Web API | MDN

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createCDATASection() 创建并返回一个新的 CDATA 片段节点。

var CDATASectionNode = document.createCDATASection(data);

• CDATASectionNode 是一个 CDATA 片段节点。
• data 包含了要被添加至 CDATA 片段的数据的字符串。

var docu = new DOMParser().parseFromString("<xml></xml>", "application/xml");

var cdata = docu.createCDATASection("Some <CDATA> data & then some");

docu.getElementsByTagName("xml")[0].appendChild(cdata);

alert(new XMLSerializer().serializeToString(docu));
// Displays: <xml><![CDATA[Some <CDATA> data & then some]]></xml>

• This will only work with XML, not HTML documents (as HTML documents do not support CDATA sections); attempting it on an HTML document will throw NOT_SUPPORTED_ERR.
• Will throw a NS_ERROR_DOM_INVALID_CHARACTER_ERR exception if one tries to submit the closing CDATA sequence ("]]>") as part of the data, so unescaped user-provided data cannot be safely used without with this method getting this exception (createTextNode() can often be used in its place).

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