在此页

• 句法
• 范例
• 规范
• 浏览器兼容性
• 相关话题

只读 invalidIteratorState 特性为 XPathResult interface signifies that the iterator has become invalid. It is true if XPathResult.resultType is UNORDERED_NODE_ITERATOR_TYPE or ORDERED_NODE_ITERATOR_TYPE and the document has been modified since this result was returned.

注意： 此特征可用于 Web 工作者 .

句法

var iteratorState = result.invalidIteratorState;
					

返回值

A boolean value indicating whether the iterator has become invalid.

范例

The following example shows the use of the invalidIteratorState 特性。

HTML

<div>XPath example</div>
<p>Iterator state: <output></output></p>
					

JavaScript

var xpath = "//div";
var result = document.evaluate(xpath, document, null, XPathResult.ANY_TYPE, null);
// Invalidates the iterator state
document.querySelector("div").remove();
document.querySelector("output").textContent = result.invalidIteratorState ? "invalid" : "valid";
					

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.invalidIteratorState' 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. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
invalidIteratorState	Chrome Yes	Edge 12	Firefox Yes	IE ?	Opera Yes	Safari ?	WebView Android Yes	Chrome Android Yes	Firefox Android Yes	Opera Android Yes	Safari iOS ?	Samsung Internet Android Yes

图例

完整支持

完整支持

兼容性未知 ?

兼容性未知

元数据

• 最后修改： Dec 7, 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()