在此页

• 方法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

XPathEvaluator interface allows to compile and evaluate XPath 表达式。

It is implemented by the Document 接口。

方法

XPathEvaluator.createExpression()

Creates a parsed XPath expression with resolved namespaces.

XPathEvaluator.createNSResolver()

Adapts any DOM node to resolve namespaces allowing the XPath expression to be evaluated relative to the context of the node where it appeared within the document.

XPathEvaluator.evaluate()

Evaluates an XPath expression string and returns a result of the specified type if possible.

范例

The following example shows the use of the XPathEvaluator 接口。

HTML

<div>XPath example</div>
<div>Number of <div>s: <output></output></div>
					

JavaScript

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

规范	状态	注释
DOM (文档对象模型) 3 级 XPath 规范 在该规范中的 XPathEvaluator 定义。	推荐	初始定义

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

No compatibility data found. Please contribute data for "api.XPathEvaluator" (depth: 1) to the MDN 兼容性数据存储库 .

另请参阅

• document.createExpression()
• XPathExpression

元数据

• 最后修改： Mar 18, 2019

相关话题

1. XPathEvaluator
2. 方法

   1. createExpression()
   2. createNSResolver()
   3. evaluate()
3. 实现通过：

   1. Document