NodeFilter.acceptNode()

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句法
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规范
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NodeFilter.acceptNode() method returns an unsigned short that will be used to tell if a given 节点 must be accepted or not by the NodeIterator or TreeWalker iteration algorithm. This method is expected to be written by the user of a NodeFilter . Possible return values are:

常量	描述
`NodeFilter.FILTER_ACCEPT`	Value returned by the `NodeFilter.acceptNode()` method when a node should be accepted.
`NodeFilter.FILTER_REJECT`	Value to be returned by the `NodeFilter.acceptNode()` method when a node should be rejected. The children of rejected nodes are not visited by the `NodeIterator` or `TreeWalker` object; this value is treated as "skip this node and all its children".
`NodeFilter.FILTER_SKIP`	Value to be returned by `NodeFilter.acceptNode()` for nodes to be skipped by the `NodeIterator` or `TreeWalker` object. The children of skipped nodes are still considered. This is treated as "skip this node but not its children".

函数应返回 NodeFilter.FILTER_ACCEPT , which causes the TreeWalker to return the node, NodeFilter.FILTER_REJECT , which causes the TreeWalker to ignore the entire subtree, or NodeFilter.FILTER_SKIP .

The browser doesn't provide any object implementing this method. It is the user who is expected to write an object implementing the NodeFilter interface, tailoring the acceptNode() method to its needs, and using it with some TreeWalker or NodeIterator 对象。

句法

result = nodeFilter.acceptNode(node)

参数

node: 是 节点 being the object to check against the filter.

范例

var nodeIterator = document.createNodeIterator(
  // Node to use as root
  document.getElementById('someId'),
  // Only consider nodes that are text nodes (nodeType 3)
  NodeFilter.SHOW_TEXT,
  // Object containing the function to use for the acceptNode method
  // of the NodeFilter
    { acceptNode: function(node) {
      // Logic to determine whether to accept, reject or skip node
      // In this case, only accept nodes that have content
      // other than whitespace
      if ( ! /^\s*$/.test(node.data) ) {
        return NodeFilter.FILTER_ACCEPT;
      }
    }
  },
  false
);
// Show the content of every non-empty text node that is a child of root
var node;
while ((node = iterator.nextNode())) {
  alert(node.data);
}

规范

规范	状态	注释
DOM The definition of 'NodeFilter.acceptNode()' 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 'NodeFilter.acceptNode()' in that specification.	过时	初始定义。

浏览器兼容性

The compatibility table on 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
`acceptNode`	Chrome 1	Edge 12	Firefox 2	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 it belongs to: NodeFilter .

元数据

最后修改： Nov 30, 2019

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句法

参数

范例

规范

浏览器兼容性

图例

另请参阅

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