问题
I was wondering what exactly a node is in JavaScript?
As in the functions:
element.nodeType
row.parentNode.removeChild(row);
回答1:
A "node", in this context, is simply an HTML element. The "DOM" is a tree structure that represents the HTML of the website, and every HTML element is a "node". See Document Object Model (DOM).
More specifically, "Node" is an interface that is implemented by multiple other objects, including "document" and "element". All objects implementing the "Node" interface can be treated similarly. The term "node" therefore (in the DOM context) means any object that implements the "Node" interface. Most commonly that is an element object representing a HTML element.
回答2:
Nodes are in the DOM aka Document Object model. In the DOM, all parts of the document, such as elements, attributes, text, etc. are organized in a hierarchical tree-like structure; consisting of parents and children. These individual parts of the document are known as nodes.
The topmost node is the root node (Document Node) of the DOM tree, which has one child, the <html> element and so on.
Further, the text content inside an element is a child node of the parent element, for example, "Mobile OS" is considered as a child node of the <h1> that contains it, and so on.
Comments inside the HTML document are nodes in the DOM tree as well even though they dont effect the document in any way.
HTML attributes such as id, class, title, style, etc. are also considered as nodes in DOM hierarchy.
来源：https://stackoverflow.com/questions/24974621/what-is-a-node-in-javascript