XPath 错误自返回结果后，文档发生了变异答案

【问题标题】：XPath error The document has mutated since the result was returnedXPath 错误自返回结果后，文档发生了变异
【发布时间】：2018-06-22 10:45:26
【问题描述】：

我正在尝试在页面上使用 xpath，但收到错误 Uncaught DOMException: Failed to execute 'iterateNext' on 'XPathResult': The document has mutated since the result was returned.

xpath = document.evalutate('//a', document)
xpath.iterateNext()

怎么了？

【问题讨论】：

XPath iteration Exception: "An attempt was made to use an object that is not, or is no longer, usable"的可能重复

标签： javascript html dom xpath

【解决方案1】：

问题是页面在生成 XPathResult 对象和访问其中的对象之间发生了变化。

改为使用快照

xpath = document.evaluate('//td/a', document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null)
xpath.snapshotItem(0)
xpath.snapshotItem(1)

【讨论】：

【解决方案2】：

如果您的提议是只读的，则可以克隆上下文节点：

xpath = document.evaluate('//a', document.cloneNode(true))
xpath.iterateNext()

【讨论】：