XPathEvaluator

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.

XPathEvaluator 接口能够对 XPath 表达式进行编译和求值。

该接口实现自Document的接口。

方法

XPathEvaluator.createExpression()

创建一个解析过的 XPath 和解析后的 namespaces

XPathEvaluator.createNSResolver()

任意 DOM 节点能够通过该方法来解析 namespaces，允许通过节点出现在文档中的相对上下文对 XPath 表达式进行求值。

XPathEvaluator.evaluate()

对 XPath 字符串求值，返回可能的确切类型的匹配结果。

示例

下面的实例展示了如何使用XPathEvaluator接口。

HTML

html
<div>XPath example</div>
<div>Number of &lt;div&gt;s: <output></output></div>

JavaScript

js
var xpath = "//div";
var evaluator = new XPathEvaluator();
var expression = evaluator.createExpression("//div");
var result = expression.evaluate(
  document,
  XPathResult.ORDERED_NODE_SNAPSHOT_TYPE,
);
document.querySelector("output").textContent = result.snapshotLength;

结果

规范

Specification
DOM Standard
# interface-xpathevaluator

浏览器兼容性

BCD tables only load in the browser

参见