java getChildNodes() 返回的 DOM NodeList 的顺序

Order of DOM NodeList returned by getChildNodes()

提问by Adrian Mouat

The DOM method getChildNodes()returns a NodeListof the children of the current Node. Whilst a NodeListis ordered, is the list guaranteed to be in document order?

DOM 方法getChildNodes()返回NodeList当前Node. 虽然 aNodeList是有序的，但列表是否保证按文档顺序排列？

For example, given <a><b/><c/><d/></a>is a.getChildNodes()guaranteed to return a NodeListwith b, cand din that order?

例如，假设<a><b/><c/><d/></a>是a.getChildNodes()保证返回一个NodeList与b，c并d按此顺序？

The javadocisn't clear on this.

该javadoc的不明确这一点。

采纳答案by sblundy

In my experience, yes. The DOM specisn't any clearer. If you're paranoid, try something like

根据我的经验，是的。该DOM规范没有任何清晰。如果你是偏执狂，试试像

current = node.firstChild;
while(null != current) {
    ...
    current = current.nextSibling;
}

回答by EBGreen

My experience is that every time that I have bothered to look it has been in document order. However, I believe that I read somewhere it is not guaranteed to be in document order. I can't find where I read that right now, so take it as hearsay. I think your best bet if you musthave them in document order would be to use FirstChild then NextSibling until there are no more sibs.

我的经验是，每次我费心去查看它时，都是按文档顺序排列的。但是，我相信我在某处阅读了它并不能保证按文档顺序排列。我现在找不到我在哪里读到的，所以把它当作道听途说。我认为如果您必须按文档顺序排列它们，最好的选择是使用 FirstChild 然后使用 NextSibling 直到没有更多的同胞。

回答by John Millikin

A document-ordered node list is the behavior in other implementations of the DOM, such as Javascript's or Python's. And a randomly-ordered node list would be utterly useless. I think it's safe to depend on nodes being returned in document order.

文档顺序节点列表是 DOM 的其他实现中的行为，例如 Javascript 或 Python。一个随机排序的节点列表将完全没用。我认为依赖以文档顺序返回的节点是安全的。

回答by Calum

I'd love to tell you that this is guaranteed (as I believe it is) but the Document Object Model specificationitself seems ambiguous in this case. I'm pretty sure that it's always document-order, though.

我很想告诉你这是有保证的（我相信是这样），但在这种情况下，文档对象模型规范本身似乎不明确。不过，我很确定它始终是文档顺序。

回答by BrewinBombers

In your example, as presented. I believe so. However, I've experienced real-world experiences where spaces have been interpreted as nodes so:

在您的示例中，如所示。我相信是这样。但是，我经历过将空间解释为节点的现实世界的经验，因此：

<a><b/><c/><d/></a>

is different than

不同于

<a><b/> <c/><d/></a>

if you're looking at index [1], firefox and IE may present different results. I would advise against relying on the order depending on your need.

如果您正在查看索引 [1]，则 firefox 和 IE 可能会显示不同的结果。我建议不要根据您的需要依赖订单。

回答by houston

Yes they are ordered as it returns a nodeList, you would have to say getNamedChildNodes to get a list that is not ordered as in namedNodeList.

是的，它们在返回 nodeList 时已排序，您必须说 getNamedChildNodes 才能获取未按 namedNodeList 排序的列表。