NodeIterator.whatToShow

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NodeIterator.whatToShow read-only property represents an unsigned integer representing a bitmask signifying what types of nodes should be returned by the NodeIterator .

句法

var nodeTypes = nodeIterator.whatToShow;

The values that can be combined to form the bitmask are:

常量	数值	描述
`NodeFilter.SHOW_ALL`	`-1` (that is the max value of `unsigned long` )	展示所有节点。
`NodeFilter.SHOW_ATTRIBUTE`	`2`	Shows attribute `Attr` nodes. This is meaningful only when creating a `NodeIterator` or `TreeWalker` 采用 `Attr` node as its root; in this case, it means that the attribute node will appear in the first position of the iteration or traversal. Since attributes are never children of other nodes, they do not appear when traversing over the document tree.
`NodeFilter.SHOW_CDATA_SECTION`	`8`	展示 `CDATASection` 节点。
`NodeFilter.SHOW_COMMENT`	`128`	展示 `注释` 节点。
`NodeFilter.SHOW_DOCUMENT`	`256`	展示 `Document` 节点。
`NodeFilter.SHOW_DOCUMENT_FRAGMENT`	`1024`	展示 `DocumentFragment` 节点。
`NodeFilter.SHOW_DOCUMENT_TYPE`	`512`	展示 `DocumentType` 节点。
`NodeFilter.SHOW_ELEMENT`	`1`	展示 `元素` 节点。
`NodeFilter.SHOW_ENTITY`	`32`	展示 `Entity` nodes. This is meaningful only when creating a `NodeIterator` or `TreeWalker` 采用 `Entity` node as its root; in this case, it means that the `Entity` node will appear in the first position of the traversal. Since entities are not part of the document tree, they do not appear when traversing over the document tree.
`NodeFilter.SHOW_ENTITY_REFERENCE`	`16`	展示 `EntityReference` 节点。
`NodeFilter.SHOW_NOTATION`	`2048`	展示 `Notation` nodes. This is meaningful only when creating a `NodeIterator` or `TreeWalker` 采用 `Notation` node as its root; in this case, it means that the `Notation` node will appear in the first position of the traversal. Since entities are not part of the document tree, they do not appear when traversing over the document tree.
`NodeFilter.SHOW_PROCESSING_INSTRUCTION`	`64`	展示 `ProcessingInstruction` 节点。
`NodeFilter.SHOW_TEXT`	`4`	展示 `文本` 节点。

范例

var nodeIterator = document.createNodeIterator(
    document.body,
    NodeFilter.SHOW_ELEMENT + NodeFilter.SHOW_COMMENT + NodeFilter.SHOW_TEXT,
    { acceptNode: function(node) { return NodeFilter.FILTER_ACCEPT; } },
    false
);
if( (nodeIterator.whatToShow == NodeFilter.SHOW_ALL) ||
    (nodeIterator.whatToShow % (NodeFilter.SHOW_COMMENT*2)) >= NodeFilter.SHOW_COMMENT) {
    // nodeIterator will show comments
}

规范

规范	状态	注释
DOM The definition of 'NodeIterator.whatToShow' in that specification.	实时标准	无变化自 Document Object Model (DOM) Level 2 Traversal and Range Specification .
Document Object Model (DOM) Level 2 Traversal and Range Specification The definition of 'NodeIterator.whatToShow' in that specification.	过时	初始定义。

浏览器兼容性

The compatibility table in 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. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`whatToShow`	Chrome 1	Edge 12	Firefox 3.5	IE 9	Opera 9	Safari 3	WebView Android Yes	Chrome Android Yes	Firefox Android 4	Opera Android 10.1	Safari iOS 3	Samsung Internet Android Yes

图例

完整支持

另请参阅

The interface this property belongs to: NodeIterator .

元数据

最后修改： 2019 年 3 月 23 日

DOM (文档对象模型)
NodeIterator
特性
1. expandEntityReferences
2. filter
3. pointerBeforeReferenceNode
4. referenceNode
5. root
6. whatToShow
方法
1. ~~detach()~~
2. nextNode()
3. previousNode()
DOM 相关页面

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