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• 句法
• 范例
• 规范
• 浏览器兼容性
• 相关话题

snapshotItem() 方法在 XPathResult interface returns an item of the snapshot collection or null in case the index is not within the range of nodes. Unlike the iterator result, the snapshot does not become invalid, but may not correspond to the current document if it is mutated.

句法

var node = result.snapshotItem(i);
					

返回值

节点 at the given index within the node set of the XPathResult .

异常

TYPE_ERR

若 XPathResult.resultType 不是 UNORDERED_NODE_SNAPSHOT_TYPE or ORDERED_NODE_SNAPSHOT_TYPE ， XPathException 类型 TYPE_ERR is thrown.

范例

The following example shows the use of the snapshotItem() 方法。

HTML

<div>XPath example</div>
<div>Tag names of the matched nodes: <output></output></div>
					

JavaScript

var xpath = "//div";
var result = document.evaluate(xpath, document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
var node = null;
var tagNames = [];
for(var i = 0; i < result.snapshotLength; i++) {
  var node = result.snapshotItem(i);
  tagNames.push(node.localName);
}
document.querySelector("output").textContent = tagNames.join(", ");
					

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.snapshotItem()' 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.snapshotItem()" (depth: 1) to the MDN 兼容性数据存储库 .

元数据

• 最后修改： Mar 29, 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()