Document.createExpression() - Web APIs 编辑

This method compiles an XPathExpression which can then be used for (repeated) evaluations.

Syntax

xpathExpr = document.createExpression(xpathText, namespaceURLMapper);

Parameters

• xpathText is a string which is the XPath expression to be compiled.
• namespaceURLMapper is a function which maps a namespace prefix to a namespace URL (or null if none needed).

Firefox 3 note

Prior to Firefox 3, you could call this method on documents other than the one you planned to run the XPath against. Under Firefox 3, you must call it on the same document.

Return value

XPathExpression

Browser compatibility

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See also

• Document.evaluate()
• XPathExpression