document.createExpression

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

该方法将编译生成一个 XPathExpression,可以于来多次执行。

你必须在将要运行表达式的同一文档上调用此方法。

语法

js
createExpression(xpathText, namespaceURLMapper)

参数

xpathText

一个将被编译的 XPath 字符串表达式。

namespaceURLMapper

将命名空间前缀映射到命名空间 URL 的函数(若不需要,则为 null)。

返回值

示例

js
const xpathExpr = document.createExpression("//div");
const xpathResult = xpathExpr.evaluate(document); // 返回一个 XPathResult 对象
const nodeContext = document.querySelector("nav");
// 重复使用 XPathExpression "xpathExpr"
const otherResult = xpathExpr.evaluate(nodeContext); // 返回一个 XPathResult 对象

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
createExpression

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

参见