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• 句法
• 范例
• 规范
• 浏览器兼容性
• 相关话题

只读 booleanValue 特性为 XPathResult interface returns the boolean value of a result with XPathResult.resultType being BOOLEAN_TYPE .

注意： 此特征可用于 Web 工作者 .

句法

var value = result.booleanValue;
					

返回值

The return value is the boolean value of the XPathResult 返回通过 Document.evaluate() .

异常

TYPE_ERR

若 XPathResult.resultType 不是 BOOLEAN_TYPE ， XPathException 类型 TYPE_ERR is thrown.

范例

The following example shows the use of the booleanValue 特性。

HTML

<div>XPath example</div>
<p>Text is 'XPath example': <output></output></p>
					

JavaScript

var xpath = "//div/text() = 'XPath example'";
var result = document.evaluate(xpath, document, null, XPathResult.BOOLEAN_TYPE, null);
document.querySelector("output").textContent = result.booleanValue;
					

结果

规范

规范	状态	注释
DOM (文档对象模型) 3 级 XPath 规范 The definition of 'XPathResult.booleanValue' in that specification.	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.XPathResult.booleanValue" (depth: 1) to the MDN 兼容性数据存储库 .

元数据

• 最后修改： Mar 18, 2019

相关话题

1. XPathResult
2. 特性

   1. booleanValue
   2. invalidIteratorState
   3. numberValue
   4. resultType
   5. singleNodeValue
   6. snapshotLength
   7. stringValue
3. 方法

   1. iterateNext()
   2. snapshotItem()