Document.createTreeWalker()

document.createTreeWalker(root, whatToShow[, filter[, entityReferenceExpansion]]);

root

TreeWalker Node. .

whatToShow Optional

NodeFilter unsigned long . . SHOW_ALL 0xFFFFFFFF.

NodeFilter.SHOW_ALL	-1 (unsigned long )	Shows all nodes.
NodeFilter.SHOW_ATTRIBUTE	2	Shows attribute Attr nodes. This is meaningful only when creating a TreeWalker with an 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	Shows CDATASection nodes.
NodeFilter.SHOW_COMMENT	128	Shows Comment nodes.
NodeFilter.SHOW_DOCUMENT	256	Shows Document nodes.
NodeFilter.SHOW_DOCUMENT_FRAGMENT	1024	Shows DocumentFragment nodes.
NodeFilter.SHOW_DOCUMENT_TYPE	512	Shows DocumentType nodes.
NodeFilter.SHOW_ELEMENT	1	Shows Element nodes.
NodeFilter.SHOW_ENTITY	32	Shows Entity nodes. This is meaningful only when creating a TreeWalker with an 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	Shows EntityReference nodes.
NodeFilter.SHOW_NOTATION	2048	Shows Notation nodes. This is meaningful only when creating a TreeWalker with a 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	Shows ProcessingInstruction nodes.
NodeFilter.SHOW_TEXT	4	Shows Text nodes.

filter Optional

NodeFilter. TreeWalker whatToShow acceptNode .

entityReferenceExpansion Optional

EntityReference Boolean .

TreeWalker .

body , , ( acceptNode() ), ( ) .

var treeWalker = document.createTreeWalker(
  document.body,
  NodeFilter.SHOW_ELEMENT,
  {
    acceptNode: function (node) {
      return NodeFilter.FILTER_ACCEPT;
    },
  },
  false,
);

var nodeList = [];

while (treeWalker.nextNode()) nodeList.push(treeWalker.currentNode);

• : TreeWalker.
• createTreeWalker on MSDN