The nearest related node access method of a node in javascript_javascript skills

In JavaScript, for each node in the document, there is

parentNode - parent node

firstChild - the first child node

lastChild - the last child node

previousSibling - the immediately preceding sibling node

nextSibling - the immediately following sibling node

Five related nodes, these nodes may not exist , is null. For example, document does not contain parent nodes, and text node (TextNode) does not contain child nodes.

This allows you to take a short trip and visit some related nodes of the current node.

In addition, there are childNode[] (contains all child nodes) and children[] (contains only child nodes of type element node, excluding text node textNode).