XML DOM - NodeList 对象
NodeList 对象表示一个有序的节点列表。
NodeList 对象
节点列表中的节点可以通过它们的索引号（从 0 开始）访问。
节点列表会保持最新。如果节点列表或 XML 文档中的元素被删除或添加，列表会自动更新。
注意： 在节点列表中，节点以它们在 XML 文档中指定的顺序返回。
NodeList 对象属性
| 属性 | 描述 |
|---|---|
| length | 返回节点列表中的节点数 |
NodeList 对象方法
| 方法 | 描述 |
|---|---|
| item() | 返回节点列表中指定索引处的节点 |
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