如何在XPath中为空节点的text()返回“"? [英] How do I return '' for an empty node's text() in XPath?

问题描述

<td></td><td>foo</td>

我想返回['', 'foo']，但是libxml的xpath //td/text()仅返回['foo'].如何找到空标签为''而不是(不匹配)?

I would like to return ['', 'foo'] but libxml's xpath //td/text() returns just ['foo']. How do I find the empty tag as '' instead of (not matched)?

推荐答案

只要您专门选择文本节点，就不能.因为第一个<td>中根本没有文本节点.

As long as you are selecting text nodes specifically, you can't. Because there simply is no text node in the first <td>.

将XPath表达式更改为'//td'时，将获得两个<td>节点.在进一步处理中使用其文本值.

When you change your XPath expression to '//td', you get the two <td> nodes. Use their text value in further processing.

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